Hi I'm using a akz250 3 axis one at the moment and it works without problems. I've heard some people complaining about the reliability of usb motion controllers in general but I have not run very long jobs so I can't comment on that. I have cut jobs of at least 30 mins without any issues which is about as long as I'll ever run as I break big jobs into smaller ones in case I have to stop and rerun something.

Overall I'm happy with the card, it was easy to set up and it it does exactly what its supposed to. My as idea was to get started using this and then upgrade to something better but at this point I can't see any good reason to upgrade to something more expensive.

Only issue I have is that I sometimes get a "sync lost" message in mach3 when jogging. Have not really spend a lot of time to figure out what it actually means but it does not appear to affect anything.