2 hours ... Ack!
I bought a Delkin brand Firewire CF reader years ago, just before USB 2.0 came out. My PC didn't have a Firewire port, so I had to buy that, too. I haven't had any problems with it at all.
Although USB 2.0 is theoretically much faster than Firewire, I've tested my USB 2.0 CF reader against it and found that they run at more-or-less the same speed for large (17 MP) RAW files. Buy whichever is cheaper.