I have been using a Sony Xperia M2 dual(D2302) model Smartphone since June 2014, and its still running strong. The design is impeccable and so is the finish.
The phone sports a 4.7" display with good enough amount of pixel density. The Sound and the music player of Sony is at its best in the phone, Trademark SONY, just nails it. The phone fits in the pockets easily unlike some unusually large phones from the Japanese smartphone maker.
Now that the price has come down drastically for this model, it is certainly a good buy .
Give it a shot folks!