I have it, I like it.
My only complaints are similar to PhilB - OLED can be hard to read unless you're pressing the fire button, and no step-down voltage regulation (though, AFAIK, the SX350 chip is the only chip capable of that right now, and I haven't seen many mods that incorporate that chip).
It's super-hefty (good and bad), and wields like a light saber with a
kayfun on it (it is HUGE!). But it has no problems firing my Kayfun Lite + built at .9 ohms all day long...
I've had a
tank leak 2ml of
juice all over the connection/head, and I've dropped it several times, and it has always bounced back. One time, I dropped it so hard that the head popped out a couple of mm on one side. I just banged it back down into place and kept on vapin'.
My biggest complaint is that I could have waited a month and gotten the 30w for the same price
;-)