I have been talking to a local guy that has been installing lifts for over 25 years. He said the main thing to look for is to make sure any lift you are buying is ALI certified. That means it has been third party tested to verify that it can and will hold the weight that it is rated at. I saw a video somewhere of a lift that was not ALI certified and it crumbled at way less than the load rating on it. If I can find the video I'll post a link.
I've been looking at the Challenger lifts (www.challengerlifts.com
) and the rotary revolution lifts. I'm more of a 2-post lift fan for general service work purposes but I have also been considering a 4-post lift for parking and storage to get one of the camaro up in the air to free up garage space.