I'm really excited to see how the Look works for you. It's a simpler system than the Garmin: for example, it doesn't automatically determine its orientation, so it needs to be carefully aligned so it can accurately determine what portion of force is propulsive torque, and what part is perpendicular to this. I keep scanning Garmin team bikes, looking for the power meters, but so far they've been using just the pedals (without pods). If the pedals appeared on pro bikes I'd view that as a good sign. If you do end up getting the Garmins as replacement, I'm interested in seeing what you think of them.

For me an issue with both of these systems is they require Look pedals, and I like Speedplays for several reasons (double-sided, light, can be used with walking shoes comfortably). For mountain biking or touring or randonneuring I prefer mountain bike shoes (I use Frogs). So limiting my power meter to one pedal type is an issue.