Flown with them before. They and Westjet are the standard cheaper airlines in Canada (no Canadian air travel is really cheap). Don't remember any major issues. I lost my luggage at Vancouver (not their fault, someone had taken it) and the staff at the airport were useless. I think that can happen with most airlines though and luckily the person returned it to me.
I'd fly with them again if the price were a lot better than Air Canada, think they just go slightly less sociable hours etc and I prefer Heathrow.
Post edited at 17:29