I have the Blackstar HT 5 combo (5 watt) and has a very nice a smooth high gain sound and a sweet clean sound. Am very happy with it.
If you are looking for the "Thrash metal - Tripple recitifier" type of sound, this is not your thing but it delivers a smooth, warm middle to high gain sound, for nice & heavy AC/DC & Guns n roses type of sounds. Its surprisingly loud for 5 watt. You can keep up with a sturdy bass and drummer for practice. The amp sounds best when you turn it up (as every valve amp does) it has a single ECC83 and a 12BH17 valve.
There is a line and headphone out (Speaker emulated) to practice in silence.
It sound great without added distortions overdrives etc Just add a touch of reverb and you have a killer tone!
Try it.