I bought my TJ's full hydro from that same guy, it worked pretty good IMO. I called him and talked to him about it and he was good to deal with. I liked buying a 'kit' like that, which had everything together in one package.
I was happy with it, a double ended ram is obviously better, but for that price it works great. It's not quite as stable at speed as a double ended ram, but it works well for what I wanted. It worked very well offroad 98% of the time. There were one or 2 times that my steering bound up and I couldn't turn the wheels, but I think that would be the case for almost any other full hydro system in the same position.
If you're driving on the street with a single-ended full hydro ram, you will want some kind of 'street' anti-sway bar. Without any kind of swaybar my TJ was incredibly unstable and darted all over the road over 35 MPH. The steering input is NOT linear when making minor adjustments at speed, a small adjustment of the steering wheel would make a pretty substantial change at the tires. After adding the Teraflex Dual-Rate swaybar the TJ I could drive around 60-65 MPH with the single-ended fully hydro.
