At least one thing can be concluded from a thread like this: Tone is very subjective! I have only used Thermionik amp sims since the last versions were released. I even used them coupled with Rosen Digital IRs on my bands latest record and I think it sounds great. A lot of this imo is the fact that the amp plugins have a power amp and a "dynamics" knob that seems to give the amp more lifelike response. Other than that: TH3 is one of the better ones, Bias is really disappointing and I'm looking forward to the Helix release!