I got my order today. It's funny that one of the drive is ok but the other one is extremely slow. I tried to copy 92 mp3 files, total size about 280MB. The good one takes about 2 minutes but the slow one takes more than 8 minutes. I have emailed Simpletech to ask for a replacement, let's see what they say.
I also have other USB drives. For the same mp3 files, it's 1 minute and 15 seconds for Kingston Data Traveler 1GB drive, about 2 minutes also for ACP-EP 2GB drive and PNY 1GB drive.