None yet.
So far, this has been a great phone! I wanted to either get an MP3 player or a new phone, and fortunately, with the Fusic, I've got the best of both worlds!
The overall quality of this phone is pretty good, and it's very easy to use, with well-defined menus, and the ability to personalize the phone with main and sub screen savers, make this a great device for those who want more from their phone.
The only things that I'm not amazed with on this phone are easily taken care of with a little cash and a little know-how.
First of all, and this is the good news, it supports micro SD cards up to (I think) 2 gigs. I bought two 1 gig cards for very little money, and can put tons of music on it with ease. The controls on the front are intuitive if you've used an Ipod or similar MP3 player.
Now for the bad. This comes with "only" a 64 megs card, only allowing about 10 songs or so out of the box.
The video, while very high quality is available, is not the iPod standard mp4, but 3gp, which is a simpler version of mp4.
That said, get this phone if you can, you won't be sorry!
This phone almost immediately disappointed.
Sometimes, when I flip it open to answer a call, the phone freezes up and continues to ring.
The MP3 player is almost useless because songs continually freeze up. This is very annoying if I'm listening to an audio book or downloaded podcast and I have to go all the way to the beginning and find where it got stuck.
I refuse to recommend this phone to anybody. I've had fewer problems from far cheaper phones.
Note: A Comments RSS Feed 
is available.