Been using b585 for almost 1 month.

The interface & design is more iphone's feel.
Added some really useful features compared to EMUI 4 but it also remove some useful features from EMUI 4.

I can notice the battery drain is faster than before especially during standby. Standby mgmt is really bad even in ultra power saving it drained battery. Operating temperature is higher & phone easily get hot even only use for surfing. Sometimes the phone is lagging.

U have the same problem as mine,
I just did my battery change, I can obviously see the original  battery thickened compare to a new one. The repair guy told me that if the battery keep thickened for longer time, it may push against the screen and may crack it. It is worth to take phone for a check up. Lol.