Worth the value? To me yes, very happy with it. Simple pedal that need not much tweaking to get a good sound(to me that is).
Want to get a tube sounding pedal can be a difficult task. One peson might find it tubey sounding, other might find it too compressed, to thin, too much gain or artificial sounding. Important thing is that the pedal can give you the tone you want in your mind.
Other than the gt-2, if your budget allow, check out the tonebone hot british(with 12ax7). Theres a review by jmguitar in this forum if not wrong. You might want to check that out