I do admit that there is a bit of planning required on your part when it comes to data bundles on your part...specially if you are a heavy downloader. But it is rather easy to log in, check how much you have left, then check on your download manager or torrent software how much your torrents come to. So if you have 800megs left, but you see that you will be downloading 1.5 gigs...then you mos know you are gonna go OOB and then it is just a question of requesting a add on bundle to cover the shortfall...in this case 700megs so you can add a once off 750meg bundle.
Also, we have the functionality to enter a alternate number that will be notified once your bundle is depleted..so if you have a 3G sim in a modem, you can ask us to load your cell number in your phone as the alternate...so we will SMS your phone instead of the modem to notify you once you are about to go oob.