EPSi has IRs on an SDCard included with it. I didn't try them, I've already made my mind up about using Ownhammer IRs because they make such a huge difference over other IRs out there. They're easy to find a good one because they include studio ready mixed IRs with all the mics in one IR & sound incredible. I'm pretty impressed so far after one day. Will have some sound samples this week sometime. My son keeps borrowing it to do his DJent stuff on. I'm doing some 80's metal sounding stuff I never thought I'd get on Eleven Rack. Getting some great Nuno Bettencourt Pornografitti, Jake E. Lee & Zakk Wylde tones I always wanted & the feel is completely different, what I would think I would get from the real thing or Axe FX II or something. My fingers hurt, but I got more I want to do. It's that good.

You have to buy Ownhammer IRs. I think the studio mix ones are $19. I got this one: http://www.ownhammer.com/store/index.php?main_page=product_info&products_id=104

You have to put numbers in front of other IRs, like this:
Small price to pay. What I do is once I find my goto ones, I change the first digit, so I can bypass all the 400s and go to 500 to get to the V30s, and 600s to get to the Scumbacks. After a while, I'll probably just use the Alnico Blue, V30s, and Scumbacks for everything instead of throwing all these on there. The very first Studio Mixes are always the ones I like, so I could put every speaker on here and only have 30 banks or so. From those, I can EQ anything and they seem to be the close mic/high presence ones so sound great off the bat anyhow.

The EPSi has IRs on board, but everybody here who owns one says the Ownhammer IRs that you can/must buy separately from ownhammer.com are superior. I'm expecting to receive my EPSi these days, we will see.
Afaik there is no trial of downloadable IRs, but there are some free ones on various sites.

Ownhammer has some free downloads (http://www.ownhammer.com/free/public-beta-redux/), you could use a computer based ir loader (some examples:http://www.grebz.com/simulator_cabs_eng.php) to 'try before you buy'. EPsi eliminates the 'computer' part and is way simpler to interface to the 11 rack.

Ownhammer is simply the best ones that i've heard. they play nice with the eleven rack without any fuss.

I sat on this for a bit, both the responses and content from the link I clicked on (ownhammer). In that site, I saw the "convolution reverb" term used a lot. Is this like that, where the guitar signal sort of passes through this sort of filter type thing?

One other thought. There's that sense of being in the same room with your tube amp that keeps many people using both digital and analog. Does this technology make any headway to that end?

Of course that doesn't mean I can't run a little send to a convolution reverb. I think there's one buried somewhere in my Native Instruments Komplete bundle. Maybe in the rarely used Guitar Rig portion?

Thanks, folks, for all the responses and taking the time to explain. I'll dig deeper and find some audio samples now.

Ownhammer basically takes a test sound and runs it through a speaker (picked up by various mics) & sends that through a nice analog/tube mic preamp, then through an analog EQ (some with tubes for certain mics), then a program compares the two and injects the "extras" so you have an effect of just the speaker through a mic/pre/EQ to send your preamp or Eleven Rack through. They go a step further on some IRs and have multiple mics & room sounds, or a completely isolated dry sound or studio sound. It's good stuff. Reverbs are a whole new ball game, but you could make an impulse with an Ownhammer cabinet and your favorite reverb with Voxengo Deconvolver and a test tone in your DAW. Bounce the effected sound and load up the tone for the before and the new wav file so it can run a comparison. It gets very close for me, and helps with reamping stuff but doesn't always feel as good for tracking as just using the original Ownhammer IR once I change too much stuff.

in my opinion, the Ownhammer IR's give the 11R a much better in the room tone (for those of us that like that). and that helps the feel factor a ton. when using a guitar cabinet in the room; you can do stuff like squeal a note/pinch harmonic and have this sort of compression thing working because the guitar speaker rolls off at a certain frequency and the high notes have no where to go, so they sound like they are compressing. Ownhammer IR's will do that for you like a normal guitar cabinet.

the thing i like best about the mixes they created is that they totally captured the entire cabinet sound instead of just an sm57 in front of the grill.

what i'm looking forward to doing next is to make IR's using two different IR's panned wide to form a stereo IR. some of the best stuff i've heard was done that way.

now that TLTD is back in the mix with us, expect to hear some fantastic combos of IR's.

OK, so now I'm even more curious than just a simple "what are you guys talking about?" kind of thing. I've certainly tweaked my fair share of 11R rigs to get that over-kill hiss out. If this system adds some of that guitar amp feeling into the tone, I'd be one happy camper.

I was reading as much as I could digest in one sitting of that thread Singtall posted. I'm a bit bummed that it's only 44.1k. Not sure it really matters, but everything I've done for years has been at 48. I hope they expand their range. Is that still the preferred unit? (the logidy Espi)

The 44.1k thing doesn't really matter because (for owners of the EPSi) the EPSi does its own conversion outside the 11r, you would never be able to hear a difference in a live setting. For studio use, the OwnHammer stuff comes in all sorts of sample rates, they have 48k as well.

For me, the EPSi plus OwnHammer mixes really take the 11r into "wow, this is a real amp now!" territory, I haven't touched my tube amp in over 2 months now and I am seriously considering selling it. That is how convincing the IRs are. It might be weird to think of tube amp sound being so dependent on cab sound, but that is what I have witnessed and it seems it is the missing piece of the puzzle for me moving completely digital.. YMMV..

That EPSi review thread does a good job of addressing many of the questions you may have or yet think of, so check it out as well.

I will see if I can post some sample clips of the 11r with and without the IRs tonight.