I'm really surprised to read all comments about 'known issues' with the Speedplay system.
I've had them on both my race and winter bike now for over a year and have around 6000 miles collectively on them. I've never had any issues. They've never jammed or failed to release and the one time I needed replacement cleats I was able to buy them very easily. I've only done it once mind, so maybe I got lucky?
They are much easier to get into than other systems, they are not wholly unlike SPDs in that you simply step onto them. This actually makes them a better option for commuting because I'm stopping and starting a lot with traffic lights.
The reason I initially went with them was because I have broad feet and I needed to adjust my foor position laterally. Speedplay is the only system that allows you to do that although Shimano do offer versions of their pedal that have a 4mm longer axle. Speedplay also make it very easy to adjust the amount of rotational float you get.
Walking in the cleats is no different to a Look type cleat.
I use a little dry lub on the cleat spring every now and then and have pumped in grease once or twice. I really like them but then pedal choice is deeply personal.