Looking for a seasoned swimmer opinion on the Garmin 910xt.

As some of you may know Garmin has come out with a new "multisport" triathlon watch that is waterproof and calculates swim metrics. Some features are: length counting, stroke efficiency, etc. I come from a running background and find Garmin products very useful but I wanted to get a "real swimmer's" opinion about the swim functions. Here is a link if you haven't seen the watch buy.garmin.com/.../shop.do Thanks!