Mine has been an interesting one. It's fast when it works, but that isn't usually the case.
My 3G service for some reason will stop working. I'll have full bars, it'll be blazing a long and then bam, it can't connect to anything. I'm wondering if its perhaps my iPad? I have my iPhone right next to me and it'll work perfectly with the same amount of bars, but my iPad will keep spinning and spinning and then eventually say it timed out or cannot connect to the server.
Even if i put it in airplane mode and wait for 10 seconds, turn of the cellular chip for 10 seconds, or restart the iPad; I still get nothing.