if you read the small print, there is whats called fair usage. No matter what speed you pay for, whether it be 1, 2, 4 or 8 GB, once you have downloaded 15GB your speed will be limited to 512kb (max) speed for the rest of that month. You can continue to download as much as you like but at that much slower speed until a new month starts...so although its an unlimited package, it does have some limitations.
I too would be interested to hear if anyone as got a better package from another provider.