I used it with three different speakers. The sound is dull and dark, I have to run the bass very low and the treble high, even with a strat with vintage-style pickups, and I still don't get a bright tone. It definitelly doesn't have the shimmer and briliance of Fender Blackface or of Vox AC30 amps.
It does respond similar to a tube amp, it feels better than most basic solid-state amps but not as great as a tube amp. When pushed the tone is ok, not unpleasant but not very natural either.
It is VERY VERY loud. I used it at 8 ohms load (25W) with a 1x12" open back cab and it carried me through a loud surf gig (we play loud and clean) with lots of unused headroom. People say you can't compare solid-state to tube watts but in this case, it is as loud and clean as a tube amp of the same wattage.
The option of 1/100th and 1/10th power attenuation is great. At home I use the 1/100th. Not sure if there are any tonal differences between these modes yet.
The features are nice but they are implemented with numerous tiny switches at the back, with tiny lettering. They feel cheap, unreliable and hard to locate and turn on/off. These switches make it feel like a toy and make me hesitant to rely on it. I don't expect it to last years and years.
I used the headphone out with a pair of good Beyerdynamic headphones and I could hear some kind of clipping, just from the weak strat pickups. I can't hear this clipping on the speakers so I guess it is a fault of the headphone/line-out path.
It is extremely light and portability could have been a big plus but the lack of a case and the big and heavy power supply kinda negate this protability benefit.
It would have been better to include the supply in the housing of the amp, make it a bit bigger and provide a bag. If they also upgraded the switches then it would be a professional piece of gear.
I'll probably keep it as a backup in case my tube amps fail or to use when I can't carry much.
