Using Jolla Phone with US Carriers, Experience?

I have been interested in trying out the Jolla Phone but alas, they aren't sold in the US. Now, do to an upcoming trip, I may be able to purchase one and bring back to use.

Thanks to this question: https://news.ycombinator.com/item?id=8630561

I know that a fair portion of the phone's capabilities work on T-Mobile.

I would like to know if anyone has used the Jolla Phone on any other US cell carriers? And how were those experiences?

edit: formatting