I nervously took the plunge today and picked up a DT25 head and I've got to say that this is a great little amp. I wanted something versitile for gigging and here it is. It has great cleans (seriously nice TBH) and it really does cover a wide variety of tones with the Class A/AB, Pentode/Triode, negative feedback stuff. I was getting a great bluesy tone by using the Recto model in triode and Class A with the gain turned right down and the poweramp pushed. The sound is close enough to a decent tube amp that you don't focus on it being half digital and just enjoy the sounds you get from it. It doesn't sound digital but it doesn't always sound 'quite' like a quality tube rig. It sounds great though and depending on the sound you dial in, it sounds extremely tubey. The dynamics are nice though the front end isn't as nice as something the 11R or a tube amp. But it's nice to play and very responsive. I can't wait to cranked it fully (I've given it a fairly decent run for a few hours) and see how it performs. I feel that the Topology 1 and III are too quiet in comparison to say a clean sound from Top II but that can be pretty easily fixed with the HD 500. It's decently loud though it's not going to shake the place like a 50 watter (the DT50 seemed alot louder even though I'm currently running it through two Orange 1x12's CB cabs stacked on top of each other). Everyone that has ever said the following is absolutely correct...the HD series sounds MUCH better when run through the DT amps when compared to running it into a poweramp or fx return. Now this brings up a question...why is this? I've run the HD through SS amps, dedicated tube poweramps, FX returns on numerous amps and now the DT and why is this? Is the HD gimped to not work to its full when it's not used with the DT? Seems a bit odd as I've spent alot of time tweaking the thing and it just seems to need hardly any tweaks to get a good tone via the DT. It's simple where I previously would tweak and tweak even adding pre and post EQs to get it sounding 'right'. Just plug in the HD to the DT, adjust to taste and it sounds good...hmm... For the money (espec if you can pick up 2/3 of the dream rig - HD and DT - second hand) it's a killer bar/small gig rig. I don't personally think you need the variax as any decent guitar can be dialed in a 100 different ways with the 20 odd preamps you have at your disposal or you can tailor any sounds for a bright or dark guitar using the stuff sitting in front of you. I hope it's ultimately loud 'enough' but I do have a 4x12 for any extra ompff if I need it. So far, two thumbs up.