I'm a basic, warm water, tropical vacation recreational diver (with a dive buddy wife who is also). I struggled over this decision for quite a while. Ultimately bought two Perdix AI units (one of which is right in front of me, I literally just opened the box for the first time) - one for the wife for Christmas, and one for me this week for an upcoming trip to Cozumel (honestly, my wife insisted I get one too, she wants our computers "to match" - so I had to).
Why I was tempted by the G2:
Slightly "Prettier" screen display (the Perdix appears a bit more "no nonsense" where the G2 seemed to have a slightly more "graphical" look to it).
Seems to be newer than the Perdix (based on intro date). That's not always a good thing, but in general newer toys have better features.
The biometrics integration. This is "wow" stuff - at least initially. No competitor has it. Then I realized that I (and even more so, my spouse) would probably quickly tire of the whole chest band thing...while I can agree the biometric info could be useful, I wasn't convinced how important it is in its current implementation (at least for the kind of diving we do). Given that, I could easily imagine just skipping the whole chest band experience after the first few dives - dive gear is plenty complex already for a recreational diver, and one of the reasons for going AI is to streamline things a bit (yeah, we will still have our consoles along as backups). The prospect of introducing yet more stuff to wear, adjust, futz with, and manage just seemed unattractive with questionable benefit. I also had to wonder how much the chest strap/biometrics was more of a gimmick than a technological edge.
Why I chose the Perdix:
Many of the reasons mentioned above.
Ticks all my boxes (and my needs are fairly modest - probably will never get into serious tech diving).
I prefer the battery setup.
Less expensive than the G2.
The company. This is what ultimately tipped the balance for me. They appear to be universally held in the highest regard for customer service, integrity, responsiveness. Also, I live in Seattle...in a pinch, the Shearwater HQ is within driving distance of my home, and their US distributor is less than an hour away. I figure if I have some dive computer crisis the day before I fly off to Pago Pago, I'll have a decent shot at getting it resolved locally.
We haven't used the Perdixes (is that the correct plural form? Perdices?) yet. We're headed for Cozumel next month and will see how we live diving with them then.