Just finished assembling mine, which is the standard 5000lb. model. I'm waiting for the extensions to use as the lift points on our Explorers are 66 inches and require the EXTensions for safe operation. I didn't buy the 5000lb. EXT model, as I want to be able to use it with cars with narrower lift points. Will post my impressions once I've used it to rotate tires. One point to note, insure you have clearance above the vehicle. They recommend 3 feet I believe. I have less so I may not be able to raise to the higher locking lift level.