Easy to use and seems to work fine. Fan is noisy but at least airflow is adequate. One thing to be aware of is the external button controls don't function the same as the built in panel for stop/start and rev. The external button must be latched to keep the motor running. I used a 3 way rotary switch in the end. No problems encountered with radio noise or interference, and the controller has good control of the motor start and stop speed. Even though it doesn't have braking, the motor spins down fast enough on my lathe. Not enough mileage to comment on reliability, but it been put through its paces with no signs of distress.
Shame these units are discontinued, as I have a couple of other machines that could benefit from one.