Pentimento, I upgraded right after I got the TH2 Producer version. I think I'm getting famous around here for touting TH2 as a must-have!!! I have used all the sims you can think of and at the end of the run I only end up using 2. TH2 and Amplitube 3. TH2 full version is that good. The main appeal of TH2 full to me is the Brunetti amps and cabs, the Randalls, plus the added FX!!! The Brunettis are jawdropping once you master the different tone switches. For mainstream rock, blues or jazz, hands down it gets used everytime. I don't do much shred music. Mostly things in the vein of classic rock, reggae, blues, r&b, and on. I have even used TH2 live using a foot midi controller and almost all of my picker buds were astounded at the sound I was getting out of a laptop plugged straight in the board.
Amplitube 3 has been good but didn't really deliver until I got the Fender and Hendrix bundles. TH2 filled the void very nicely. Yes, I tried BIAS and S-Gear, Guitar Rig, etc.. They are stellar but compare the bells and whistles you get in TH2 at the price.
I have found more instances than not where TH2 slipped right in to the mix with almost no effort at all where I might struggle with another sim for a while to get what was needed. If you have the funds, TH2 Full is a no-brainer! It's good enough that I would buy it even if I didn't suffer a GAS attack! LOL!!!