Delagrange stepper driver board

Has anyone seen or heard anything about these driver boards? They can
be seen at www.dtllc.com. I am looking at his 4 axis boards(uni-polar
currently). He is working on a bi-polar one currently. My main
question is, this driver is a L/R type and does not adjust the
current
to the motor as it goes faster. It is fixed with resistors. Will this
give a very different performance than a chopper drive would? I
really
like the price and look of his uni-polar, 4 axis board. It is very
clean and professional looking.

Scott