Here are a few problems with that.
1) Incredibly slow speed. Actual speeds come nowhere close to Advertised speeds. It generally takes a few minutes to transfer one song between my MP3 player and my W580i.
2) Flaky connection, including external interference from WiFi, Phones, Microwaves, other sources of ER radiation.
3) No access to GDFS. You need to press C so that it goes into a sort of "Emergency Transfer Mode" so you can have access to it.