I have two Samsung Galaxy Phones, one is DUOS. Over all its a very good phone and almost 50% credit goes to Android :P.Well about the phone, the touch is awesome, specially, if you have used Nokia before.
Sometimes, if you install too many applications, it becomes bit slow (not much though). Otherwise, there are a lot of applications which are good to use.
The voice quality is also good, especially with the new headphones which samsung gives with the phone.
One problem which I face sometimes is that without installing Software, I am not able to use it even as Data storage device :(
All in all I am happy with the phone
Good touch.
Nice Battery Back UP(Dont forget to switch off WIFI, when not in use)
Can be used as WiFi Router (Battery highly used)
Good camera
Comfortable new Headphones.
Takes comparatively more time to charge with Data cable.
It has been two months. If I find anything new, will update... :)