They get pretty good reviews. They use Toronto City airport rather than Pearson. They have their own ferry that goes back and forth between the island and the foot of Bathurst St.
They fly all Q400's, so no jets. But they look like they are pretty well outfitted. They started service to IAD recently. I am considering giving them a go. They are having a sale right now but fares seem to be more or less competitive with other airlines rather than being a LCC.