Just got DIF90 installed few days ago, tm guys came to installed fibre follow by digi guy installed router, so it is using tm infra.
The router brand is zte and surprisingly wifi signal strength is quite good, no problem covering both lower and upper floor. Speed test show 48mbps dl and 18mbps ul only unable to hit full 50/20.
Anyway it is suffice for my usage now. 2 persons using it to work from home , no problem using company vpn connect for works, MS Team meeting is smooth, phone, youtube, and some lite pc games also no problem. So far encountered one time no network but it resolved after restart the modem.
I don't use p2p, torrent, and tvbox, so can't comment much on this area. Overall it is quite a value package for sub 100.

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When you apply for it?

In my case, I applied thru digi website on last Thursday night, and get dg call on Saturday to confirm the appointment. So it took 2 days to get the response. Then they came to install on Monday. I would say the whole process is quite fast.
Hope you are getting the smooth experience too.

I just read that TM going to transfer of providing public IP to private IP by phase. I think many ISP will follow suit. With Digi being the first.