HELP regarding TATA SKY Binge

Hi Dimers,

I have no experience regarding smart/android set top box.
I am planning to purchase Tata sky Binge+ Android set top box via current Dhamaka offer to replace existing dish tv STB as below :

https://www.amazon.in/TATA-Free-Android-Box-DHA...

is it good buy ? are there any other better alternatives for android set top box ?

And most important question : Do we have to mandatorily subscribe to Tata Sky Binge (299 per month) for OTT apps subscription ? I already have amazon prime, hotstar vip, zee5, discovery subscriptions on my mobile number, can I use the same with this set top box without subscribing to Binge ?

My plan is to use as broadcast (for parents) as well as OTT (with my own purchased subscriptions). Will it work as per my plan ?

Thanks in advance.