Thanks for the info on Shearwater. But even if I had the inclination to spend that much, it's too large for me. I'm interested because I travel light, and without a laptop when I can. My iPhone has a nice DiveLog app, and it would be great to be able to pair a dive computer with it. I don't agree that pairing devices is a pain, and I've never had to redo a pairing with any device. In addition, there are more computers sold today that don't have IR than those that don't have bluetooth. My desktop, which doesn't have IR, is so overloaded with USB devices that an 8 port HUB isn't enough. I don't want another cable and I don't want another dongle. On my laptop, which does have IR, the IR is used by drivers as a remote control receiver, and I'm sure it would be more of a pain to have to disable the drivers for IR to work with the laptop each time than to pair devices once. And while IR might work ok, fact is it is not designed for data transfer while bluetooth is. Bluetooth wouldn't eat batteries unless it is enabled, which it wouldn't be except for data transfer.
At any rate, a diver computer manufacturer who delivers a rec diver/consumer diver computer with bluetooth will set itself off from the rest. Others can keep track of their dongles.