i have the LE, 80gig external USB and have never had any problems. i've moved 10 gigs in something like 40 seconds....dunno what you're doing that takes so long.
the difference really : USB1= 400 USB2= 480
80 mbps, that's it. i transfer at 380-390 regularly.
anyway : the whole point being that you don't need to worry bout it.
AKsys. has never frozen on my Athlon 1200, and transfer is a breeze.
i do notice some problems if you're computer hibernates while connected : but that's all avoided with connecting, transfer and disable.
if you're system is crashing MAD T, i've found that sweeping daily with this program
http://www.lavasoftusa.com/ gets rid of a lot of data miners which flake out your system.
hope that helps!