I did a search in the amps section and didn't see any threads devoted to the appreciation of GK Fusion amps. I will soon be buying a GK Fusion head (Just not sure which one yet). I know the MB Fusion 800 isn't released yet , but I added it to the thread title so I don't need to change things up when it is released. I made a thread about "what is the best GK head" , but would like to narrow things down to just the Fusion heads. I would love to hear from owners of the Fusion 550 and the MB Fusion 500 to see what they think of their Fusion amps (Pros and Cons). There were a lot of positive comments on them in my 'Best GK Head' thread. I'll be sure to post my comments when I make my decision and purchase one. Thanks - Looking forward to hearing from you.