So the Lemo and Big Dripper V2 turned up the other day.
Verdict?
Lemo craps all over a Kayfun IMO.
Reading other threads about it is interesting. Some find it too airy, while others find it too tight.
Me? All the way open isn't quite airy enough when you're into drippers, but you can still get a good lung hit and I think it's quality. No regrets on this one, though I wish the drop version was available when I ordered it - not that it's too, too big after changing the ridiculously long stock drip tip.
Fwiw, I never got around to rebuilding the Orchid V4 with a more reasonable set of coils (and probably won't bother), but I think the Lemo is better. The Orchid's draw is a little tighter and can be more prone to leakage. As always with these things, it's really a case of what suits the individual at the end of the day.
Big Dripper V2
Pleased to say that this thing is very nice. Only done a single coil @0.5ohm so far, and it's all cool. Good flavour/clouds with a nice draw.
You do only need to 'squonk' the tip a couple of times or you may flood it. Other than that, the only other criticism I can think of - apart from the position of the drip hole and airflow ports - is that the tank can get emptied fairly quickly, but I think it may have less capacity than the original.
It didn't leak or continue to dribble and fill when I left it overnight with a full tank either. Also comes with a nice wide bore tip.