I bought Nokia 6681 a year and half back. It was a buzzword in the market then. The feature that fancied me a lot at that time was the camera cover. although, later found out that the mobile has some real good features and is actually worth the amount. The sound quality is good. Till ofcourse, we dont compare it with the N-Series. The camera is good, though the pics are blurred when you use zoom. The image / video editing softwares are good and real fun even for a beginner. The new bluetooth software doesnt let other cell phones to restart your cell phone, as used to happen with Nokia 6600. The mobile supports a plenty of audio formats. And you can enjoy your sound tracks on the stereo speakers on the mobile. The volume is high enough to be audible in a large room. And even at high volumes, the sound quality doesnt degrade.
Overall, this peice is worth buying. Until unless you have a service provider which gives 3G support, 6681 is better than the twin 6680.
The mobile has been worth the cost I paid for it. and I am definitely very happy with my investment in buying this one.