It's very versatile! I recommend playing around with it on your PC with the x-edit software.. you can also google "rp350 patches" and it'll take you to a site with all the patches from digitech's forums that users upload.
I like that it can emulate different amps.. I just hook it up to my pc and blast it on my computer speakers heh.. but it's so far good on a solid state crate gfx 212 amp.. does the job.. but make sure you have a send/return aka fx loop because that will give you the best sound.
Just be patient.. it's a very complex product.. play around with the software, and if you lke what you hear, save it!
Today I was playing with the 350 just through my computer speakers, and the amp models are AMAZING! A JCM 800 sounds like an 800.. the dual rectifier sounds like one... zomg it's awesome! so fun to edit effects