I was on an amp quest recently and tried the Rebel 30, Tweaker 15 and Tweaker 40 (all combos), comparing them with some other amps, like a Fender Hot Rod Deluxe III and ... something else I can't remember (that one obviously left a good impression).
I think the design and controls on the Rebel are near-perfect for me: a clean channel 1 with two band EQ; a dirty channel 2 with 3-band EQ and master volume; a reverb control and watts knob for each channel; plus the master tube mix knob and an effects loop. Just what I needed!
I found the watts and tube mix knobs didn't make as much difference as I expected, and would have required more playing with to get the best out of them.
But it's all about the sound, and although I was tempted by the Rebel, eventually I ended up with the Tweaker 15 - it sounded clearer to me. The Rebel has a thicker tone. Depends what sort of sound you're after. I tend to start with a Fendery clean tone and work my way towards a Marshally crunch with pedals. The nice thing about the Tweaker is that I can start with a Fendery tone, or a Voxy tone, or a Marshally tone. I've got a lot of knob-tweaking to do in the next few weeks...
Interestingly, the Tweaker 15 (with 6V6s) sounded much clearer to me than the Tweaker 40 (with 6L6s) with exactly the same settings. I always thought of 6L6s as giving you the glassy Fender Blackface tone, but the Tweaker 15 did it far better. So much for received wisdom off the internet! The other thing that may have had an effect is the speakers: the 15 has a Celestion G12H30, while the 40 has a Celestion Custom Elite GH50. Also, I knew from the guy in the shop that the 15 had been thrashed for months as a demo unit, so maybe it was a case of speaker break-in too.
The whole experience reinforced my belief that you can read as much as you like on the interwebs, but there's no substitute for trying things yourself.