I kind of agree with Toe-Knee. For me the GH gives me a very good rock and metal sound but doesn't have loads of character like a Marshall's "roar" for example. That doesn't mean it sounds bad though!
+1 (not that I think that the modern marshalls have much character, I mean compared to the real high-end/boutique amps). that was my feeling with the vc30 and vc15- they were killer for the money (this was a couple of years back when you could get the 30 new for £300 and the 15 new for little more than £200), but if you could spend more you could get a more sophisiticated tone.
That being said I love my gh50l. But it is a bit rawer/grittier than a lot of the higher-end high gainers, it's more of a hot-rodded marshall vibe- if you like that or that's what you're going for, it's great, but if you're used to the more refined, smoother take on high gain that a lot of the higher-end amps have, you might not. Again, it's awesome for the money (I got mine for less than £400 new), but I wouldn't take it over a soldano or anything like that, lol.
The vh100r is similar to the gh, I think (it gets the rep of basically being a gh with an added clean channel, but it's ages since I've tried one).
Really liked the tt when I tried it, but again it's ages since I tried one. I'd need to try both the vh and tt head to head against the jvm to be sure which i preferred.