I bought and have since returned a Revv Generator 120 MkIII. Unless you get a chance to try one in person to see if you vibe with it, I would advise everyone to stay away from Revv. It has a lot of features, but it's lacking in tone. It doesn't sound like most amps; doesn't feel "alive". Kind of dull.
Here's my honest review of it:
- Clean channel (Blue) is not the best clean I have heard, but it's the best channel on the amp IMO
- Crunch (Green) is like a pushed 5150 sound. Sort of fuzz-ish, like it's on the verge of clipping. Can get gainy.
- Lead 1 (Purple) is similar to a 5150 III blue/red channel. Tighter, very compressed type of gain. Doesn't sound all that amazing.
- Lead 2 (Red) is Recto/Uber inspired, but doesn't sound like or as good as either of the amps it's copying. More compression, darker than Lead 1. Neither lead channels thump you in the chest like some other amps do.
The amp just sounds very tame and neutral overall. The salesman at the store I got it from told me he felt the same way. I like the feature set on the amp and the packaging/goodies are great. Not worth the tradeoff in tone though.
I've heard great things about KSR. I got their compact tube power amp (the PA50) recently and it sounds fantastic with my FM3, so I can recommend that wholeheartedly. I also found a decent deal on a 2014 Colossus on Reverb that I'm planning to get sent to Kyle for upgrades. I'll be surprised if I end up not liking it.