It is cheap indeed, but it is also nothing more than a piker. You'll need to buy additional power resistors to allow a higher supply voltage for some speed. These resistors are not cheap while this solution still doesn't perform as good as a "real" chopper drive.
A chopper drive costs more but draws less power from your supply due to (much) better efficiency. You can end up with a much smaller and cheaper power supply compensating for the cost of the choppers. If 2.5 Amps is sufficient the xylotex boards could be a good alternative at 40$.
regards,
John |