For those of you looking into Mohawk lifts..this is a brief synopsis of my System I install..
I purchased a used, late 80's (guesstimated) System I, 9000lb lift from a commercial shop in the Phialdephia area for approx $2250.
I had the lift installed within a week by Mohawk Lifts of PA out of Lititz, PA as referred by Floyd in this thread.
Below is an album of a few pictures of the install..
http://img84.imageshack.us/g/p1020885b.jpg/
The lift works great. Lee had a lot of good info to share. I know one of the biggest questions about these lifts is regarding the leveling of the individual lift posts since they each have their own dedicated hydraulic ram. In operation, the secondary post or slave cylinder is probably 1/2" to 1" behind the main. You can hear the safety latches clicking one after the other with a slight delay. This sounds like alot but really isn't considering the posts are 10' apart. And if you lower the lift onto the safety stops as you're supposed to, it levels everything perfectly.
When the System I lifts were redesigned and rated at 10,000lbs capacity, Mohawk made 2 significant changes to the lifts. The first being the addition of a diverter valve, to help with the sychronization of the lift posts..and the addition of a support brace around the columns near the center section which increased the capacity. Apparently, when near or at full capacity and heavily front or back loaded (vehicle not centered front to back), the 9000lb lift columns were seperating. By separating I mean the column itself would bulge in the center a little from the load not being properly centered. That's the reason for the increase in capacity.
I was also informed that the hydraulic cylinders are supposedly covered by a lifetime warranty. The cylinder would need to be taken out and shipped to Mohawk and they will rebuild it and send it back, if anything ever happened.
Anyhow, everything is working great thus far and I am very happy with my purchase.

The installation cost was $400 plus bolts which came to just over $500. Great service from Lee @ Mohawk Lifts of PA.