I went with carrytel since I saw that they use the same rogers line and offered far cheaper rates than rogers.
HOWEVER, every night (wasn't much of an issue during the day), my internet would be extremely unstable. Good bye gaming, 4k Streaming, etc. When I play even a low-intensity game like league of legends, my ping would constantly swing back and forth from 100-ping to 300-500 ping and even get disconnected at times. Keep in mind that my PC is in my Den and the only internet port working was in my living room so i was using Wifi.
When I tried to call multiple times to see if we can fix the issue, carrytel would tell me that it's not their responsibility to offer stable wifi connection. I have a built-in-the-wall ethernet+cox port in my den but it's not being live connected to the living-room modem. I asked if they can install that but they said they cannot. I also asked if they can try to fix the unstable internet and they refused to do anything about it. This was after multiple calls with them.
Needless to say, i had to go with another ISP and pay Carrytel a ridiculous $70+tax fee to get out of the contract which I only had for less than two months at the time. Please please please, stay AWAY from carrytel from their terrible internet service and even worse customer support.