My usage doesn't equal your usage. Only you can answer such questions. I justify for you, but you don't use on my level.. Then how? Just check your needs and if you have to keep seeking justification, then you don't need it. More available bandwidth for others.. 

There is a way if you dont know Chinese language, install asus app setup by phone. I do this

Will need to follow John Lai's advice as even using the app I only got about 660 - 700Mbps. Edge browser seems to be better in my case as its consistently above 700Mbps.

Do contact me with regards to ur plasma recalibration.

No such thing lol. I am sure that router and your BTU supports 100Mbps. C1200 definitely can reach 100Mbps on 5GHz AC, but I would recommend you change to C7 v5 or Tenda AC18, if you want something better.

Tenda ac18. Flash to merlin firmware.

Just got turbo-ed to 800mbps, paying RM199. 

How to get back 800Mbps, with RM179 or RM189?

Did you complaint?
And you are one of lucky subscriber to get 800 Mbps?

Add rm10 to get 800Mbps?

I was on RYE 100 before turbo-ed to 800, and i am paying less than rm189 for it.

Not sure whether TM will screw up my billing again, as it happen when I was upgrade from 50mb to 100mb. My billing was being DOUBLE-ed up instead of as what TM promised just a RM10 topup to double up my speed. I was  blindly charged for that DOUBLE-ed billing for 2 months just to wait them to sort out simple calculation.

Of course later on they reimbursed back the additional payment to me on the following billing....