I own a V200. Use it in my European residence. Very briefly my impressions which are just mine but though I say so myself: I'm not into fanboyism and not shy to admit expensive mistakes.
Headphone amp wise it's powerful. The build and engineering that went into it are top notch and the designer (Fried Reim) is above all an engineer and (a very distant second, the man is sometimes to honest for his own good) only secondly, a salesman). It has hardware gain dipswitches on the back that can prove very useful and for a headphone amp it delivers quite a punch.
One point of criticism if you feed it via the USB plug-in module: the USB implementation is a bit outdated. Soundwise it sets down a strong performance with just a hint of warmth but not overly so. I compared it to a Burson conductor and Antelope Zodiac Gold. Sticking to a misplaced european character analogy to illustrate things: if the conductor is a cool Brit/Scandinavian on some speed then the Antelope is a flighty, airy but superficial Italian and the V200..well...a German I guess: utterly reliable, friendly, strong but not the summum of finesse and micro-detail.
Horses for courses, a lot depends on your music taste/headphones owned and how you like your sound + your philosophy on if/where in the chain any colouring should happen.
For a combo with the HE-6 of the 3 amps mentioned I'd only consider the Vio, frankly. Does it work? Yes. You can get it plenty loud without distortion and certainly won't kick yourself if this is the only amplification you have. Is it ideal or 'the best', whatever that may be? No, with the right speaker amp you can do better. Impossible to quantify but to my ears it's about those last 10%. But youy need to pair it wirth the speaker amp that's right for you because it's possible to do a bit better than with the V200 but imo it's also possible to pick a combo that will be plenty powerful but will sound a lot worse.
Would I purchase it again? Well, if I could only own one single amp then yes, although I'd go for its successor -the V281- which will come out in june and which is set to deliver about 4 W into 50 Ohm with a 30V or so swing (balanced).
Given the fact that I can afford multiple amps I'd stick to a neutral, low-power speaker amp for the 6 and something with a bit more neutral and lighter/more detailed presentation than the V200 for the other cans, at least as far as the ss headphone amp camp is concerned.
Thanks for the insight mate, actually one of the main reason why I'm considering the V200 is because I don't fancy the hassle of balancing the T1. I'd like to stay with SE output amps, and should the V200 makes for a good pairing with the HE-6 it would certainly be a strong contender as my amp candidate.