All you really need to know is version 5 f*cking rocks, I struggled a bit going from ver 3 to ver 4. Version 5 took about 2 seconds to dial in. I have a gig tonight which will be a great way to test it but 1st impressions are that it is a major leap forward. Awhile back I did a big outdoor show at Uconn and used a 100W Friedman Marsha cranked to the max. It was one of the best live tones I have ever experienced. Version 5 reminds me of that tone but at any volume. It just rips. It just sounds and feels like an amp about to melt. If you have ever played through a marshall plexi dimed you will know what I mean. Also cleans up really well with the volume knob. This is major achievment for Cliff and crew !! How this majic black box keeps getting better is beyond me In case anyone cares, my tweaks were to pull the mater down a toucn, add a bit more pres and reduce the bass a tad and that was it.