I’ve been using Airset for quite a long time. The really appealing aspect of this service is the way it can aggregate calendars and streamline group scheduling in a personal environment, or I would imagine a small company environment as well.
I will say that the user interface could use a lot of enhancements, but the functionality rocks so I’ll deal with the UI. And I also want to take care to be clear that when I say interface enhancements I am referring to updates they should make to improve the accessibility of the service, to make it easier for people to start using it.
The business model is reasonable, the service is free but the mobile service is $5 a month. I don’t know what the numbers would have to be in order to call it critical mass, but $5 a month isn’t a big number (would be very cool if you could just bundle the charge onto your cell phone bill). It was just pointed out that the company has a relationship with Verizon, maybe the billing option is available with them?
Finally! A company comes right out and says what everyone already knows, there’s a real performance issue with Java on mobile phones. Lot’s of discussion about the mobile phone feature set, which would indicate that this part of the service would be a big differentiator (Yahoo! disagrees).