I really think that platform limitation is hindering them more than they might think. Everyone I describe the product to says "Cool! Where can I get it on my phone?" and then is immediately disappointed when told what carriers it works on. Maybe I am just in an area (Boston) where no one uses these carriers, but it seems odd to ignore such a large segment of the population.

Also, they should really make their SDK freely available. I had a few interesting ideas for location-based services I wanted to toy with, but their submission page for their SDK was broken last time I tried to submit one of my ideas. I even went so far as to email the dev team with a plea for even a basic SDK to play with, but my request was soundly ignored. Why make it so difficult to develop apps if you want your platform to be used?

Just my .02.