I downloaded the demo. I have GR4, S-Gear, Amplitube Free and AcmeBarGi and I think TH2 is pretty good, comparatively speaking. However, it has the same high frequency shrillness to it as the others. Well... AcmeBarGig doesn't have that, but the rest do.
Having said that, I will consider getting the full TH2. I need to play with it some more once X2 comes out first.
Thanks for the heads up on trying the demo!