Gator blades work well and lasted longer for me than the OEM high lift blades.  I switched back to the non-mulching high lift blades because it leaves less clumping and does a better job with dandelions and plantain stalks.  The gators don't have enough lift and the spindly stalks just lay down when you drive over and pop back up after.
I tried out a new aftermarket blade supplier this year because the local dealer keeps jacking up the blade prices on the OEMs.  I can almost buy two sets of the aftermarket blades for the same price of the Kubota blades.
Here's a general question:
OEM Kubota blades used to come with Kubota stickers on them. Last time I bought them from the dealer they looked like aftermarket blades with absolutely no stickers on them.  The dealer claimed they were OEM with a hefty price increase as well.
Has that dealer been trying to pull a fast one on me selling no-name blades as Kubota brand?  Do yours still have Kubota Part stickers on them?