Microsoft lumia 640 is a true successor.It had covered all the mistakes made by earlier lumia models.Design is great with 5 inch HD screen.
And camera 8 mp which clicks photos better than any other 8 mp does.prossesor is snapdragon which is better than media tek prossesor.it has an excelent music quality .
Overall great performance.very good reception and performance.good battery backup which lives for 2 days even with moderate usage.excellent management.no heat issue.best windows phone in this segment of price.just go for it.