Pros: It's cheap and it doesn't charge extra for two carry ons. Boarding was faster and easier than other airlines. They seat families with babies in the back, which is nice for other patrons.
Cons: Sun Country Air is the greyhound of airlines. The crew is generally rude, seats are somehow small and cramped, even compared to other airplanes, the aisle is also somehow smaller, there's no entertainment options - usually on my four hour flight home there's at least a movie option. I've had confusing and difficult interactions with disability services on two occasions and have had staff question my disability and access needs.