I like mine a lot. As said above they are slightly heavier than the Look Keo, but I liked the idea of an alloy pedal platform. There are lots of E-bay sales of brand new pedals that end up being around $90 including shipping. I looked around for a while for used ones, but found that most of the lightly-used ones ended up being bid up to almost as much as the new pedals. Basically the ebay price for the Ultegra pedals is about the same as a bike shop price for the somewhat less nice 105-grade pedal.
The one thing the Shimano pedals don't do is have an adjustable float. It is just determined by the version of cleat used. But the yellow-tipped cleats that give 6 degrees of float are fine for me.