Another focuser I have a lot of experience with is the Optec TCF-S. A superb bit of kit. Better than the robofocus in terms of accuracy, repeatability and rigididy, and also that it's its own Crayford focuser that is built like a tank. But - it of course adds back focus, has limited focus range, and also comes with a proprietary thread that you have to use adaptors (sometimes home made) to add to your system.
Again, it's temperature compensated and will self-adjust once it learns your coefficients of expansion (or should I say contraction).
Also, I find the autofocus routines only really work on good steady nights. Trying to use them in the UK was sometimes impossible. It'd finally move to the final calculated position, the seeing had changed, and the stars were well off focus
Regards,
Rob.