In my opinion Line 6 amps are only good as practice amps. They have lots of sounds, but sounds that are only really that good at lower volumes. If you want to have some quality sound, buy a tube amp.
On a side note, if anyone was thinking about getting the Line 6 Spider Valve stack:
I bought a line 6 spider valve stack a few weeks ago to try it out but I was soon disappointed. Although the amp claims to be all tube, it really isn't, the second it goes through the modelling board and effects its no longer 100% tube. To me, there is no comparison, line 6 doesn't come close to real tube. I played on an old peavey head at guitar center the day after i returned the spider valve and I couldn't believe what a difference in tone there was. Line 6 just doesn't have the warmth and richness, no matter how hard it tries.