I cant speak for others, but I have a "seperates" rig consisting of a Sansamp BDDI preamp and a QSC GX3 power amp as a back up or secondary rig to mimick my regular 80+ lbs SVT head. I would say that it does sound great, similar to a tube amp I guess but much quicker. It seems the SVT responds to playing a bit differently than the BDDI+GX3 setup. The SVT, to my ears sounds more open where the BDDI+GX3 sounds more punchy, bassy and tighter. I wouldnt say one is better than the other at this point, though I am biast towards the SVT because the BDDI+GX3 is a new thing for me.