So .... finally got round to this. Not too sure about the twisty topfill, and I HATE the stock driptip with a vengeance looks minging instantly with dark juices and it's too fat for my dainty kisser. But having said that I do like it - flavour is great, really great. It did leak (badly) on my first attempt ....... but I'll admit to being a bit cavalier with the wicking (I wicked it the way I would a doggy, forgetting this is topfill and likely to be a bit more sensitive .... and it is) and the second and third goes have been fine. Anyone else had it leak on them? .... and look @andyroo !!