I have the GIMME 5 plan. I spent about 1000J on my last 8 day trip, and that included a couple 10 minute calls to my bank in the States when they decided to block my ATM card for suspicious activity (apparently they don't like when I make 2 consecutive transactions because the ATM's per transaction limit is well below my daily limit - but I digress).

I turned on that data plan one time, but it wasn't worth using on the old BlackBerry we have. For our next trip, I'm going to pick-up a refirb iPhone 4 or maybe a Blu smartphone from ebay.