It has been a few months since I have been using this device. And I have no regrets whatsoever for paying 7500rs.
Design
Very well designed, Compact, Easy to use, Lightweight and has twin bass drivers which produce a humble bass.
Waterproof* obviously and dustproof too!
The sound quality is superb, well defined Hi-s and lows. Ample bass. Sound is enough to fill a small to medium size room.
Battery life* is so damn good. 8-10 hours easily on a single charge.
Bluetooth 4.0, so connectivity is never an issue. Range is more than 10 metres.
Can connect to multiple devices at once. I had JBL flip 1 before this. But this flip 4 is like 3 times better than that!