I recently installed the Seco-Larm electromagnet gate lock (1,300 pound pull force) on my LiftMaster LA500UL dual swing gate system, and I couldn’t be more pleased. The installation went smoothly; I chose to weld it onto the gate since I personally think that’s best, but it could easily be bolted as well.Some reviewers have mentioned issues with the wire length, but I didn’t find this to be a problem. In fact, it is too long if you use the junction box that is integrated with the magnet housing. I chose to cut the stock wire and then solder it to the longer wire that I routed through the gate's steel tubing to the controller.One minor note: I wish Seco-Larm’s “suggested” Z bracket (for dual swing installations) was available in steel rather than only aluminum alloy. Since I couldn’t find a steel option, I ended up fabricating one myself from 3/16-inch scrap steel plates, which worked great, but was an extra step that I would have happily spent the $30 to avoid.Overall, the Seco-Larm electromagnet gate lock is a solid, reliable choice for securing my gate, and I’m very satisfied with its performance!