You can also count me as a very satisfied Tangerine customer. I initially switched to then-ING for my main checking account because of the lack of monthly fees. All banking, as many transactions as you want, are free, and you can indeed use Scotia Bank ATMs for withdrawals or deposits.
Another advantage for me is that most of my family/friends also use Tangerine, so when we need to send money to each other electronically (via email money transfer) it is free as well. You can send free transfers to non-Tangerine accounts, but that can take 1-2 days, or pay a $1 fee to use the Interac email money transfer system.