Just received one from Gard at Bass Central a few days ago and gigged with it last night (thanks Gard!). Here's a quick review, keeping in mind that I've been a GK man since the mid '70s and have more recently been using an iAMP 800. The reason that I bought this amp is that I wanted to have an amp in my arsenal that has a tube preamp; I want that FAT WARM TUBE TONE, and the ability to drive the tube into a very slightly overdriven growl for some of my applications. It's rated at 300 watts @ 8 ohms and 500 watts at 4 ohms, so it has power to spare for your typical bar/club/lounge gig. The wt-550 has great tone with a formidable punch, beautiful tube warmth, lots of headroom, and all in a compact light weight head. You can dial in thunderous bottom, punchy mids, or sizzling highs, on demand with about 1/8 of a turn of the nobs. Awesome EQ! after having fun fiddling, I basically took the owner's manual suggestion and kept the parametric eq flat, and used the bass, treble, and enhance controls to dial in my tone. That was very easy to do, with no problem. one super minor gripe is that there's no handle on this head; I guess that it's meant to be rack mounted. I tried driving the preamp stage a bit hotter and got some nice tube style growl. I liked the compressor, but I found that I preferred to have it off for most of the night. Just curious, do most of you Eden owners use the compressor?