Guys - I have a Mesa Express 5:50 (non-plus)j that I bought new over six years ago. I started shopping around for a new high-end boutique amp mainly because I was bored with the 5:50. After buying/returning/selling some of the top rated $2,000 - $3,000 amps mentioned herre at TGP, I just don't think there is anything out there that is better for me than the 5:50. So I have a new found love for the 5:50. But there is still one amp that intrigues me - the 5:50+. Is there a significant improvement in the clean channel (or other channels) with the plus over the non-plus? Or would I be wasting my money? Thanks in advance!