Yes, I made the mistake of buying a chinese driver on ebay last september-october. Pathetic! My bad!
I am now going to buy a better driver for my motors. The motors are rated at 2.8A, 3.6mH and 1.4 ohms. I guess they need anything between 40-60V to perform adequately. Am I wrong about this?
I quite like the G540 and the price tag. It's conveniently all in one box, but max. voltage is 50V. The nice people at Geckodrive recommended me not to go over 51-52V. Absolute max. is 64V, but they absolutely do not recomend going anywhere near that point.
If I want a more powerful drive, I have to go to a G20x. These are a slightly more expensive option, and aren't as neat. And, if I power them with the max. voltage they could handle I think I could burn the motors. I will also need a breakboard (or whatever you call 'em).
My main question is, would a g540 be adequate for driving my motors, or would a more powerful one be best? Has anybody got a g540 with motors similar to mine? If I only use three axis on a g540, can I have the fourth with nothing connected to it? Would it get damaged?
I've also seen other brands on kelinginc.net, some "digital" step motor drivers others have kindly pointed out to me in this forum. Most people around here seem to like Geckodrives.

NOTE: I posted this in another forum, don't really know which is the right one. There are so many to choose from......