I needed an option to remove my hardtop by myself, so for Christmas I received the manual Lange hardtop lift from Quadratec and it works very well. It includes a hand crank (on the right side of the second photo below) to raise the hardtop. Lowering the hardtop is a little slower and the crank with the weight of the hardtop on it takes some figuring to get it to lower, but it works fine as I can push the hardtop around as I don't always park perfectly centered under the hardtop.
As far as the install, it took me several attempts to get the ceiling and back wall eyebolts in just the right places. Instructions were limited. You will want to put the wall eyebolt in as far up as is comfortable for you to use the hand crank. You also do need to be able to back your Jeep up to a back wall in your garage so in my case I had to clear the area, and of course have solid beams to drill the eyebolts into.
I also had to adjust the eyebolt that connects to the frame four times to get the hardtop perfectly level when it hangs. It was easy to do, but just required that I reposition the eyebolt by sliding it further towards the rear of the hardtop where all the weight is. The first time, I had the frame's eyebolt way too forward so that the hardtop was not at all level, which over that day it bent the eyebolt, so Lange immediately sent me a replacement eyebolt at no charge.
Lange does suggest that you do not use this for long term storage (I am sure for liability), however if the eyebolts are properly drilled into beams in the ceiling and back wall, it seems very sturdy. However since my wife parks under the hardtop, I did put some additional straps on for added security and peace of mind.
Note: Center eyebolt in ceiling is 68" from the back wall. Eyebolt in back wall is 81" from floor (for a 9 ft. garage).
Update Jan. 2012:
Since I finally bought a soft top, for the summer of 2011 I kept the hardtop hanging for at least six months and everything was very safe. Again, very pleased with this product and how quick it is to remove the hardtop (and by yourself too!).