quicksilver v4 monoblocks

I am running vandersteen 5a's with them before that 2ce they are the one part of my system that has stayed the same. They are reliable work well and sound great. I have herd some different amps maybe even better but as stated again at 3 x the cost and then they have more tubes and are less reliable. I did traid in my single ended V4's and bought 3 balanced ones for my frount 3 channels, what does that tell you when my upgrade is the same thing. I highly recomend them. If you can do balanced go that way. Just keep a couple extra tubs on hand.