Count me in with those who say the poor handling when things go wrong and dealing with that will wipe out your savings. Some routes aren't even daily, the schedule is thin, and if a flight gets cancelled then the only things they'll offer are rebooking to another flight of THEIRS or a refund. In the case of a high-demand route if your upcoming days are fully booked you're really hosed. MAYBE you could get a connecting flight to sub for a non-stop, but don't count on it. The idea of having to wait possibly for days for something that isn't a weather disaster or something along those lines will just be unacceptable for biz travelers, but the other option is to pay out-of-pocket, last minute, to fly someone else. In that sense it really IS A Whole Different Animal (TM).