Larken Cobra Stepper Drives

Does anyone here have any experience with, or opinions about the
Larken Cobra stepper drives? Good or bad? They list 8A and 16A
drives. If I use them with my motors, which are rated 8.5A, would
it be best to go for the 16A and run at about 50% of rated, versus
the 8A running at full load? Link to page with specs on the
Larkens http://www.storm.ca/~larken/steppers.htm Also, are there
other sources for reasonably priced stepper drives in 8A and above
sizes? (I consider the price of the Larkens reasonable)

Thanks in advance,
Cliff