My gliding club has about 20 acres of grass that needs to be cut.
We have a tractor with a reel gang-mower, but it is slow and has all the issues associated with keeping the blades sharp.
Last year we acquired two Hustler Fastrak mowers. I was sceptical at first but am now a convert. They are much faster than the tractor, so even though the swath is narrower, the job is completed in less time. Also great fun to drive.
They also make short work of the "fiddly bits" around the hangars and the campground, because of their extreme maneuverability.
Blade maintenance is simple - just replace a worn blade with a sharp one, and then sharpen the worn one at your leisure.