Everybody knows the+ve side. Let me write only -ve side and the uncomfortable part.
No Bluetooth transfer of data with other Bluetooth device. You can not transfer data though bluet ooh.
you can not use it as a USB device.
No micro SD slot.
You can only transfer audio, video, photo from PC to mobile by using Zune software.(No other data allowed, not even epub eBook)
If you want to transfer the media data to your friend PC, Zune software must be installed in his PC.
It does not support java. Can not play any java game or java apps.
Less numbers of apps in wp7 and the free app games are no use except a few.
In India, there is no marketplace in Zune software, so you can not install any apps through PC.
Zune transfer only wmv video.
You can only transfer contacts from Sim to phone, not from phone to Sim
No msg draft.