Hi,
Of course you always have to be wary of what you buy off of Ebay but you do
things to minimize your risk like checking feedback and knowing what you are
buying and know what it costs.  Mine were offered as surplus and this
company was selling lots of these at that time.  These not only handle a lot
of current but they are micro stepping drives.  10micro steps per step.
Like I said, I tried different drivers and different software until I ended
up with a very nice CNC router.  Be wary of the different Windows software
available.  I started with Kcam and the performance was just horrible.
Motors move irraticly and thus were inaccurate.  This was even with the
geckodrives.  I wanted to use windows based software, not DOS software and
tried several.  I went with Mach1 from www.artofcnc.ca.  I got a wonderful
product and great support from the author for what I consider to be a very
reasonable cost.  I was able to triple the speed of the motors for jogging
and its very smooth.  The controllers have a pot to adjust to tune them to
the motors for very smooth accurate performance.
Good luck,
FJ

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