Yeah, I heard some of those horror stories too.
I went looking around for more info for our trip and the Spirit flight is just once a week, on Saturdays. So that might make it tough for us. But the prices were amazing--from Myrtle Beach (about 1.5 hrs away) to Lima the day before Christmas and coming back three weeks later was $800. Compared to the other prices, that was amazing.
I am still on the fence about what to use. Travelover, you'll have to fill me in on your stories. I've also got to figure out how in the heck to get from Ayabaca back to Lima to even make a return flight. It is the middle of nowhere! Plus it is hard to know what date we'll actually be pushing the POS mototaxi into town anyway.