Toilet works well, and the space saving aspect is great.  It was more difficult to install than a standard toilet simply because you cannot see the bolt holes when you are lowering it into place - installation required two people (one to lift/drop it, one to lay on the floor and line up the bolts).
The very narrow tank meant that I had to be careful attaching the water line as the fill valve assembly could twist when under a lot of tension and press a moving part against the bowl.  With careful application of the water line, everything works perfectly.