The Assiomas give you a lot of data on pedal stroke and are very durable, and you can swap them between bikes where most other types of power meters are fixed to one bike. The app works great and battery life is good as well. I've had a couple of sets for more than two years, no issues with them at all. You can also now buy just the spindle so you can use Shimano cleats, but the Look cleats to me are fine.
Since 2007 I've owned and used Powertap, SRM, a couple of different quarqs, assioma's, and now have a Giant dual sided crank power meter as well... I think they are all great, but $ for $, the Assioma's are an incredible value.