Charlie.
I had one of these for a bit and wasn't a big fan. The plastic is much thicker to a unicanitor, which I find much more comfortable when there is any sitting to be done. I do believe that these had adjustable tension, and if that is your cup o' tea, track down a Spanish Arius, which is an almost exact copy of a unicanitor, but with adjustable tension.
One other trick for getting a unicanitor on the cheap is look for the smooth leather versions that are worn and ripped. Once you remove the beat up leather, you will find a nice nylon saddle with the Cinelli logos intact molded into the sides of the plastic.
Sean Flores
San Francisco, CA