I've had Fizz internet since it was introduced. It had some rough patches at the beginning, but has been pretty solid for some time now. I do have periodic issues with my modem (maybe once a month, though they haven't cropped up in maybe a month or two now), but these go away with a reboot. The issues I had at the beginning were around their billing system. There were some problems with deleting credit cards and a limit as to how many cards could be associated to your account. When my credit card got stolen and its number changed, I was unable to update Fizz with a new card number, and my internet was suspended. These issues have since been fixed and I can add/remove credit cards easily now. That said, it did expose the only major drawback with Fizz, as far as I can tell. Their support is exclusively via chat (there is no phone number to call at all) and almost useless. If you know your way around even the basics of technology, you should be fine. But I would have a tough time recommending a service like this to my parents, for example.
With respect to speed, their service is identical to what I had with Videotron. As Temporel mentioned, it is essentially rebadged Videotron Internet (though stripped of support). So, it's fast and reliable. As for price, it's better than some and worse than others. But if you consider price/performance, it's probably at the top of the list.
Reason: Removed content