Does any of you use it? I have Komplete with guitar rig and is bias that much better?
http://www.positivegrid.com/bias-desktop/

The pretty pictures are reason enough to buy it.

I like Bias Desktop a lot.  Certainly a tweaker's dream, and the sounds are in many cases more lifelike than from other amp sims I've tried.  Works great for both guitar and electric bass tracks.  Demo it yourself and see how you like it.
 
I rarely use Guitar Rig anymore -- most of the amps just don't sound that great to me.  It's fun to play with the effects, though.
 
Cheers,
Eddie
 

Bias Desktop, if you're a tweaker...is DA BOMB...

and, as Bapu said, the pretty pictures make it worth the money!

I'd buy it! As soon as I sell my corneas, I will.

Another REALLY nice Amp sim is TSE X50...

It's $58.20 US (49.99 Euro)

Has some awesome features and sounds REALLY good...

http://www.tseaudio.com/software/x50v2
 
next sale I'll be adding it to the collection...

I demoed BIAS and thought the clean sounds were really nice, the high gain sounds not so much. S-gear still the favorite with me and Kuassa Creme as well.

I know the OP didn't ask what our favourites amp sim was, but + 1 for S-Gear