Just installed a set of 4 while rotating the tires on my 2006 Mustang GT. Install was easy and straight forward. Once the tires were off, the install itself took less than 2 minutes each. I did have to take a rubber mallet to them to get them to sit back enough to prevent them from rubbing on the rims, even after flatting the clip as instructed. Only thing keeping me from rating these a 5 is that they are a bit pricey.
Covers look real nice, had CJ's install them on my 06 GT, glad I did after watching the install process I can tell you they just do not go right on. The cover on the front wheel on the passengers side needed a lot of re shaping lets say. After 5 trys of taking the wheel off and on the guys at CJ's got it to work. It was worth paying for the install with out a lift and the knowledge of what to do with these things when they don't quite fit this could have been a real pain for the average Joe.