I downloaded the free version. It's difficult to make a sweeping judgement with the little they offer but I thought the effects were quite good as was the functionality, but the amp didn't impress me. It just didn't have the richness and authentic sound that JamUp offers.

I know that I could buy a bunch of other amps and effects but for the moment I'm very pleased with the sound I have and can't justify spending more money.

Still, having some competition for Positive Grid is a good thing. It may keep them on their toes.