Siberia 840 user opinion required


I am planning to buy Siberia 840 so needed opinion from the users.

Currently I am using old and gold Nokia bh503 which is one of the all in one headset which help me in everything like jogging songs calls movies on laptop etc etc and has really good backup so I want something like that to replace that. Please help me by telling the following pts.

1. How's phone call performance I am looking for loudness as have somewhat hearing problem
2. How's bass during Bluetooth while gaming and movie watching and songs
3. Bluetooth connectivity breaking and ease of connectivity with laptop with windows 8 and Android mobile
4. Battery backup
5. Does it has the feature like boss qc35 that if battery runs out then you can plug it via 3.5mm jack to mobile and continue talking or listening songs
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