Hi Jon,

I'm very happy with the drivers. I've not worked them hard yet, but they have a decent feel of quality. They're on offer at Arc Euro at the mo - For £39 I can't find a complaint...

I bought a readymade breakoutboard from DIYCNC (PCPPS-2). This is the simple board which is not opto-isolated. As far as I remember the inputs to the drivers are opto-isolated so I decided there was no need to double-up. Also I have a scrapper of a PC running EMC2, and I'm not doing anything commercial, so the consequence of a fried motherboard is not too serious (also unlikely).

I got the one with a charge pump to improve safety, and it also has a voltage regulator to provide 5V for the limit switches, which is handy...