Whereas we would only have the option of a strong GPRS (2.5G) or weak 3G signal, we now have a strong GPRS or a not-quite-so-strong-but-stronger-than-3G HSDPA (3.5G) signal!
Now HSDPA is supposed to give you data speeds comparable to that of a home broadband service. I clocked the speed (using Mobile Speed Test) at 360kbps (with a 1MB data transfer) this morning, which is not too bad bearing in mind the relatively weak signal. On GPRS (as I am at the moment), the data speed is around 39kbps (with a 100KB data transfer) - dial-up speeds!
I hope that they improve the HSDPA service in our area, so I don't have to waste my battery life on WiFi networks instead!
Amusingly, as I type this, I've just lost signal altogether! Oh, it's back again now.