You should really find out if it's just a promo price for a short term (3 or 6 months) and what the regular price will be. If it goes way up, you can possibly downgrade your internet speed or channel packages after that. I hear that cable is sometimes on par with fibre speeds these days, so it might only be the change of tv interface you'll have to get used to. I like the Microsoft Mediaroom interface so much easier to read from far. I've seen Shaw's menu/guide. Not well laid out, and some text is TINY!
I still think landline phone (especially fibre) has better quality and reliability than cable phone. Highly debatable subject, though. Cable telephony can suffer from lag, breakup, etc. I don't know if I've ever had any issues with fibre phone.
It's so tough to make an apples-to-apples comparison with two different technologies.
Authorized Service Provider (Contractor) for MTS Allstream. Any views expressed are my own.