First, it's just recently been released, and I haven't heard of anyone that has used one yet. But his other drivers are very high quality and very polpular.
Power Supply - Just one needed, preferably 24V to 34V, about 6a minimum.
You set the current by adjusting a pot to put out a certain voltage. That voltage is VREF. You'll need a meter to set it up.
It looks like if you add some optional resistors, you're all set for limits. The board is set up for these, but not sure if they are included. Coolant might require a relay, which would not be included.
This is just info I got from checking the website, but should be accurate. If you email Jeff from Xylotex, he'll answer all your questions. He's a great guy to deal with.
HobbyCNC sells a driver that is basically the same as the Xylotex, at http://www.hobbycnc.com. A lot of people are very pleased with that one.