Let the hive mind of Engadget get that for you.
"As someone who doesn't reside in the USA, I was wondering what would be the best way to get internet for my computer in the US for a couple of weeks? If it were Europe I know I'd look for some prepaid data. Is there anything similar offered by American carriers? A MiFi or a data SIM that I can tether from would work, but I'm trying to maintain a tight budget. Help!"
I have had the TK6000 with the 99.00 UNLIMITED forever and I have never once had a problem with the service. It does however seem to end calls exactly at 2 hours talk time but all you need to do is redial the call. I love the service and the fact that I have it forever for 99.00 as long as they are still in business. I like this unit because it does not need to be plugged into a PC to make calls. It functions standalone directly connected to my FIOS router.