I've upgraded to full TH2 and I really like its sound.
The menu structure is pretty lame but maybe it's just me.
In terms of sound I'd say I like ReValverMK3.5 best.
Then comes TH2 and then Guitar Rig 5 Pro.
But, and that's a huge point for Guitar Rig: It killes all of them in terms of fx!
GR has so much more from DJ fx to a great reverb unit...you can do so much more with this programm.
Still the Amps sound much more realistic in ReValver and TH2.
But I have a use for all of them depending on the situation.