I wanted to give it enough shot before I say something. Actually, I returned it few hours ago and ordered Blackstar ht1rh mkii instead!
Sound was really big, there was nothing wrong with it. It had that famous Marshall vibe even though it's a 1 watt made in Vietnam. It nailed hard rock tones easily and thrashed with ts9 boost. I hated dsl20 and dsl40 combos when I tried them in the store, probably I didn't crank them enough or maybe combo speakers were bad in general. My v30 loaded Engl cab in the other hand made a very big difference.
The reason I returned the amp was emulated out and single 16 ohm output. I just didn't like the emulated out. Tried with audio interface and amped headphone but it was still sounding bad. Having only 16 ohm output is an another problem, my cab is 8 ohm mono, 16 ohm stereo. Blackstar ht1rh has very good emulated headphone out and aux in, it has also 4-16 ohm variety.
I will eventually get a better Marshall amp, dsl1 would be useless when I have it but I can still use Blackstar for quiet jamming.