I think the price difference between Tango and T+ is worth it for the flexibility it offers. The $50 vs $150 airport change fee is less than the cost of a Latitude fare, and I object to paying for seat selection. I fly Lat when I can, but most personal travel is T+. Probably the most important thing for me, though, is status miles, especially now when T+ gives 100%. THat can make the difference between E and SE at the end of the year.