For the money this is the best wifi drive I have found to manage a moderate number of files. The UI is easy to use. Not too many bells and whistles, but you get more with this app than with many other higher priced file storage apps.
Small Complaints/Suggestions for Improvement:
1. Once you open a file you have to close the app and reboot to get back to the main menu. For this reason I couldnt recommend this for those of you who need to continually access a large number of files on your iPhone.
2. You cannot export files from the drive into your iPhone camera roll. (note: you can import from the camera roll into the drive)
3. Viewing landscape images when the phone is held in the portrait position adds a large white bar to the bottom of the image.
D-Neils about mbDrive - WiFi flash disk