Earlier to 6131, I had a T630 (sony). When compared to that cell phone this was a major jump for me. I got my 6131 box piece around 45 days back for 11, 600 and 1, 700 for 512MB card.
Altogether it is good piece of engineering.
I was crazy about flip phones and brighter bigger displays; that is the reason I opted 6131. The display ( inner and outer), the UI , the headphone provided with it everything is awsome.
But there are drawbacks even. Battery backup is in 1st position. As I was using sony T630, battery life is not bothering me much. And the second point is , nokia is changing the charger standards. This phone has got a very small pin for the charger ( smaller than nokia bluetooth charger pin ) and the power rating is also changed, so you may have to carry the charger everywhere ( thats what I do now :-) ) . 3rd is , if you are keeping it in you jeans pocket, being a flip model, it will get scrathes on the inner sides. Be careful with that...
But I had a workaround, did some high quality sticker works and now thats no more an issue for me..
The major difference I felt was its speed. Simply faster than anyother phones. ( may be because of the S40v3 OS ).
Thats all from me now...Am enjoying my new 6131..it ROCKS!!!