I recently picked up one of these sets. The price ($93 + Shipping) was just too good to pass up. http://www.aliexpress.com/product-fm/44 ... alers.html
The package came with a controller, 3 nema17 motors and a 24v 6A power supply.
Here's the review:
Shipping took about 5 days total from the time of order. It came DHL.
The power supply is great. You plug it in and it puts out 24V volts. I don't have a method to measure the Amps, so I couldn't tell you if it's putting out the advertised value.
Stepper Motors are great - just what you'd expect for a nema17 stepper motor. The shaft is tight and has a flat ground on it, leads were about 12" each.
Controller: - not sure if it's great or not. I blew the z-axis driver about 10 minutes after everything was hooked up. As of now the X and Y work fine and I have a few ideas how to use the driver for something else. However, the driver chips (Toshiba TB6550AHQ) are completely replaceable. OK, they're not plugged in, I'll have to desolder the blown driver, but the spacing is ample and it should be an easy fix. I've ordered 3 more, which should arrive this week.
All in all I give it 6 stars (of out 10). I think I had something to do with blowing the driver as the board was just sitting on my workbench during testing (not mounted to anything, just sitting on a static bag. The z-axis I was using ended up binding, which is when the driver blew. The board also has a relay on it that says 230V max. I'm not sure how to tap into that, but the pins are accessible and I think the idea is to turn the spindle on and off. I haven't gotten that far due to not knowing how to go about hooking it up.
Surprisingly, besides the relay information, the documentation was good, the english was bad, but I was just looking for pinouts and other table type information that was easy to find.
As I said, the draw was the price. My expectations were low so I was surprised at the quality of the PS and the steppers, and like I said, the controller works great in the X/Y
Once those drivers show up I'll see just how easy it is to replace them and report back accordingly.