EKMallon:
I'm wondering if they might handle the pressure of being under water better as well?
I can't imagine they would be any less competent than the 5110, simply by virtue of being more modern. I imagine they only need be turned on for as long as they are being read, so I don't see a power problem.
I'm a fan of 5110s, but I'm seriously impressed by the OLED and I doubt I would buy another 5110.