You have got to give me a real world review of that lift. It is the exact one I am looking at right now. Going to pull the trigger in a month or so. Let us know good and bad!
The instruction booklet is minimal at best.Get onto the website and you can follow the steps and print the pics individually.In particular the most difficult was making sure all the cables were right(going around the correct pulleys) and then correctly locating the ends in the cable "collector" under the ramp.
Also you will need to pull out the ram shaft and will need some kind of "come along".I used the straps that we use to tie down loads on the trailer and they have a ratchet and are made of heavy duty webbing.It takes a fair effort to pull it out.
The welded tabs on the inside of the main ramp are for the lock release shaft to run through.Nowhere did I see it mentioned to run the threaded bolt inside these tabs.Commonsense prevailed when I got to that part.
I contacted someone in USA about running the cables and they advised to not follow the rule book.I was having trouble with the cable ends getting caught behind the pulleys.He said to do the opposite of the instructions and run the threaded end out and up the pillars to the locking position.Make sure the cables run on the inside of the white plastic cable pulley(cable will be on the ramp side of the pulley not the post side)
I did most of the assembly myself but needed another 6 guys to help lift the ramps into position for bolting to the cross beam.The ramps come upside down when packed.This is for a reason.You then have to have help to turn the ramp over and we used the 6 guys to lift the ramps onto two saw horses(steel ones to take the weight) and have the cross beam set up at that height to easily slip the bolts through.
Just make sure you double check every nut and bolt.On a test run the rear of the lift was not unlocking from the safety latches.
When I was moving the unlock handle at the front the bar under the ramp did not have the nuts of the joiner tightened so was not turning the bar and therefore not unlocking at the other end.
Another stupid thing I did was filling the fluid reservoir.I filled to the correct level and then raised the lift and all was working fine.Then I noticed the level was way down and I thought"oh it has to fill the ram underneath" and proceeded to add more fluid.Well when the lift drops it pushes the fluid in the ram back into the reservoir and then I had fluid pouring out of the fill hole.
Got it back to the right level and a clean up of the floor and all is OK.
A couple of web addresses.The first one is general info
http://www.gregsmithequipment.com/ProductDetails.asp?ProductCode=TPPRO-PARK8
This one is the Assembly guide
http://www.gregsmithequipment.com/Articles.asp?ID=301
The book says 2 men can do it in 4 hours but using some mechanical means to lift the ramps.The main ramp with the hydraulics is 440lb and the secondary ramp is 220lb.I say BS and as I did most myself it probably took closer to 10 hrs.
Now I have run it up and down several times and everything is going well.
Also moved it around on the castors(used it to put the 2 pedal cars up in the loft area) and we won't be bolting it down.Haven't put a car on yet but I am confident all will be well.
Feel free to PM me if you need more advice.
How do you put up with all that filth under there?
Glad you have the lift in to clean it. 
You are truly blessed with a wonderful house, cars and garage, and not to forget the wife who is truely wonderful for building the house around the garage.