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Benny, Im happy with my TCF-S, what can I say, it always works ;-). Temp compensating is a bonus, Ive heard robofocus is also good and reliable, although Im not sure if it is an absolute focuser (as opposed to relative, which is a small detail, ie requires homing on power up, Jase would know). I have no trouble at all with back focus on my LX200R OTA, in fact the AP 0.67F reducer I have fits inside the focuser (TCF-S is 2"), so adds nothing to back focus at all!. OPTEC drivers are included in all serious astro apps (as are Robofocus I think). I dont have any experience with the 3" version.
I suspect theres not much in it apart from travel count resolution and weight bearing capacity, the 3" would handle the ST11K no probs
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