Jet bought them out I believe and just carried the design forward. The smart sand was a nice idea. I thought it just changed the conveyor speed and not the drum motor?
I think it monitors the motor load (current) and varied the feed rate?

People seem to have the most issues with the belt tracking. I also was able to get mine set 'n' forget right off. I did switch the abrasive belt for the poly belt I now have since the abrasive belt seems to leave a small dip in the wood due to the seam being slightly higher. 
When new, it was nice and sticky so no slipping. Someday I'll scrub it down to get that sticky feeling back, but with my sled it never slips with having full contact.