I got a G3 to mostly try with a JamHub for rehearsals. I thought some of the cleaner amp sims sounded just okay and a lot of the more overdriven and high gain ones just plain sound thin, raspy, and bad to my ears. I tried a Tech 21 Blonde and a Liverpool in front of it, and imho they both sound a lot better for amp sims. Pretty decent sounds with either of those combined with most any of the non-dirt fx in the Zoom. All the delays, modulation, filters, etc. sound okay (not great but not terrible either). Tried all this into both good headphones, into a QSC K12, and in front of a Deluxe Reverb.