I owe the AW100 and it was a very good camera. Picture quality is good and the GPS lock-on quite fast (usually less than 10 secs and in some occasions, it locks on in less than 5 secs). Nikon provides regular update to the A-GPS file which allows the GPS to function faster in my testing. Usually, without updating, after a while, the GPS would tend to take longer to lock on. Post update, the time taken for lock on would be significantly reduced. This shows Nikon commitment in updating the A-GPS file regularly.
A fully charge battery will easily last around 200 - 250 shots (no video taken). The underwater performance is very good and the piece of optics in front of the lens is coated such that water droplets do not stick on the glass piece, which is very important because once out of the water, any droplets left on the glass piece would appear as "smudge".
Start up is pretty fast, about less than 1 secs and I like the part you can attach filter to the lens with the provided adapter (UR-E23). This expands the creativity part of using this camera. Overall, a solid good camera worth its price tag.