Feiyu-Tech G3 2 Axis all the way for me. It had a slightly bumpy start when if first came out (I was one of the first to own one in the UK). Really rugged all enclosed design, beefy motors so you can use ND filters no problem and it won't glitch out having a USB cable plugged into it.
They have just released v1.25 firmware which is a big improvement. Early firmware saw bad roll drift but that has been sorted now and you can even calibrate the roll amount.
Since this they brought out the Phantom mount which comes with all new units. For the money it is great value. Pretty light too.
Oh and they are working on a 3 axis version of it too coming soon I believe.