I average one flat every two years with tubeless.  More than two years with the Schwalbe Pro Ones.  They roll nice and are lighter than a tire and tube.  

Bought a pair of Mavic rims a few years ago and they came with a complimentary set of Mavic Tubeless tires, stems and sealant, so no cost trial.  Nice tires, but the Mavics wore quickly, then they sprayed sealant, or rather wept a bit.  Eventually switched to Schwalbe and excellent wear.  They actually have three layers in the sidewalls, which can be a tires weak point.  They have some sealant layer, and i add air once or twice a week.  Even handled a 6p nail one day.  Pulled the nail out, let out a little pressure, spun the tires a couple times, and was good to go.  20 seconds vs 10 minutes.  I usually pump them up to 92 psi.

Good luck

Andy Sass