I just came back from Cozumel and did 12 dives with the computer. It is a pretty terrific computer, although it has a few quirks. For instance, if you drop below 20 feet during your safety stop, it resets the timer once you ascend above 20 feet. I did one safety stop 3 times...
I think I'm going to cut a couple of inches off the strap (after I try wearing it on my forearm, as someone suggested). Even threading the excess through the back, it got lumpy.
The heartrate monitor is a fascinating feature. It was easy to see the dta when I was swimming against the current (to try and get a shot) or chasing an eagle ray (those things don't look like they are swimming fast but they are!).
As others have said, the monitor is very clear. And in spite of the million page manual, it's very intuitive and easy to use.
I didn't like that the transmitter stops sending gas info once you hit 200 lbs. however that was only a factor once. I made sure it didn't happen again. So maybe that is a built in safety feature.
I removed the sticky plastic guard - too hard to read through, I found.
I am hopeless when it comes to using the compass but even I loved the compass in this thing. It's dead easy.
The clanger? I got off the plane when it landed and headed straight to the LDS where I bought it and said it had to go back. It continuously lost the transmitter signal, even though the battery said "high". (There's another thread on this board from others who have had the same experience). Sometimes I didn't hear the beeping right away through my hood. And at some point, after the signal has been lost long enough, it ceases to calculate remaining bottom time as per air consumption. That's not a complete show stopper as I generally know when I need to start to ascend based on remaining pressure but when you pay this much for a computer, all the bells and whistles need to work. And its a PITA to constantly be trying to reconnect the signal. In a 90 minute dive, I'd probably lose it 20 or 30 times. I tried rotating the thing 180 degrees (which you can do, and which felt better on my small wrist, actually, having the weight at the bottom rather than the top), but that seemed to make the signal loss worse. Once at the LDS, the owner said that he'd never heard of this happening in any of these computers he'd sold. He phoned the rep immediately who asked a couple of basic questions - did I wear the computer on the same side as the transmitter (yes). (It wasn't pointing at my head as my regulator - an Oceanic Delta 4 FDX 10 - just doesn't allow for that.) Was the battery good (yes, brand new). So off it went. So we'll see.
The manual says that flash photography can affect the transmission. I was the only person using a camera in the group throughout my dives, and it still lost the signals even if I didn't have the strobe turned on.
I hope they will be able to get it working properly because it's a pretty cool computer. Otherwise, I will not be keeping it, obviously.