I've got about 35 dives on my Aeris A300 AI. I actually really like having my computer tethered to me rather than on my wrist. As I move into drysuit diving this week, this seems like it will be even more valuable. The conveniences of the A300 are huge as it has the air integration without needing a transmitter. The backlight is also very nice and helps readability at night. During the day I don't have any issues reading the screen.
I'm moderately tech savy, but I had trouble figuring out some of the controls and getting it to display the stats I wanted. Also, some of the functions seem to only work once the computer hits the water, so it's hard to test new settings before you're on a dive.
The digital compass actually works really well. I did my AOW navigation dives using this compass is 20ft vis and was pretty spot on.
My biggest complaint is the computer software. The software is very picky about recognizing the dive computer. To download dives, you must do things in a very specific order for my laptop to even recognize the A300 is connected to the computer. Currently I am able to download dives to my laptop, but unable to upload settings to my A300. I tried to update the Aeris software on my laptop, but that update file was not working correctly.
Overall I've been very happy with my A300 AI, but for over $800, I would expect a more reliable backend experience.