I recently purchased a Harken 4-point Hoister to install in the garage. The product number is 7803.B. You can purchase it at Quadratec, but I actually picked mine up off of Ebay for a little bit cheaper and included free shipping.
The complete instructions can be found at the link below so I am not going to reinvint the off-road wheel on this one.
My initial thoughts are this: It was really pretty easy to install. The most difficult part for me was attaching the boards to the ceiling. I am in an apartment and the ceiling has metal rafters rather then wood. I could not use lag boats to attach it so I had to use toggle bolts and make sure I spanned multiple rafters. I called Harken to see if they had done any testing on metal rafters with toggles and the rep said that he was unsure but if I spanned multiple rafters it should be fine. He suggested spanning three, I did four.
After that it was pretty simple with the exception of getting the strap tied to the lift ropes at the right height so that the top will raise level. I finally got mine level after a little bit of trial and error. If you do not get the top to raise level then it is tough to get it to lover all the way because the weight is supported by the Jeep when it reaches the body.
Lifting is a breeze and lowering it is really easy to (once you get it level). The top has been hanging from the ceiling for three days now. I was going to try and engineer my own but the cost in materials to build what I wanted would have been about the same as the cost of this kit. I recommend it if you are looking for something to raise that top.
I'll have some pictures posted later today.