I don't have experience with the 750, but I installed a Janus 3652 wind-rated door in my metal building. Mine is 12ft wide x 10 ft high. Installed it myself. No issues, easy install, and working fine for a number of years now. The 3652 has nylon guides/retainers to hold the door in the tracks. I'm not sure what the difference is on the 750. The photos of the two look very similar.