The Kemper is really a different type of product. I has effects, etc., but it's mainly an amp profiler. The price may seem high, at first, but when you consider it has all other amps in it, it's possibly the cheapest amp head you'll ever buy. It's also, pretty much, future proof. Any new amp comes out, there will be a profile for it in a couple of days.

I've used many modelers for many years. I bought the Kemper, and quickly realized that modelers give you a bit of leeway, by covering your mistakes, etc. The Kemper acts like a real amp. That's why when some people move to a real amp, they sound horrible. It took me a couple of days to break any bad habits I had that modelers would cover.