Spirit certainly has some really low fares. Now that we have that out of the way, I must say that it certainly is a you get what you pay for airline. \nI fly around a decent amount and I've learned what works with them and what doesn't. \nHere's what works: They fly to a lot of cities, a lot of their flights are direct flights without layovers. The staff at the airports have always been pleasant and courteous. They also have great last minute deals in case your flight is An emergency or if you're going on a spontaneous adventure.  People have said that their flights are bumpy and rickety but I've always had smooth sailing\nNow, here's what doesn't work. I'm about 6'3 and 210 pounds so I expect to be cramped, but their flights take it to another level. Their bag check in fees are higher than most. Their seat choice fee is higher than mist, hell just about anything an airline charges for is higher with spirit. They also love to find ways to nickel and dime the customers.  They also don't have much variety in the sense that their routes only fly once a day, for example the only Vegas to Baltimore flight is an 1130 red eye. It's a deal breaker unless you're flexible. It's also a bit of an issue because if you miss your flight you're straight SOL for awhile\n TL;DR spirit is awesome if your flight is under 3 hours and if you're packing light. Everything else, I'd generally recommend paying the difference and enjoying the comfort