Price is not an issue
Change mechanic. OEM pads are purchased in bulk and designed to be adequate. Any good quality aftermarket pad is better and if you look, you can find a pad that has the characteristics that suit the way that you ride.In search for pads to(road use), My mechanic opinion is to use only the oem yamaha pads, because the aftermarket pads with lower price than the oem will eventually reduce the life spam of the disk brakes. Is this correct or shall I change mechanic?
Bro,Note: my response is geared more toward track use.
I've tried a lot of different pads. SBS, Vesrah, PFC, EBC, Brembo... Sintered, carbon... At the end of the day, it's all about feel and preference. Do you like a strong initial bite, do you like linear vs progressive, etc. Experiment with a few and find what what you like.
My pad of choice currently is the SBS Dual Sintered race pad (634DS-1 for the 15+ R1). Very good stopping power and consistency. I really like the feel - perfectly linear (the more you squeeze, the more braking power). Not cheap, but they last me a few race weekends, which is quite impressive. They are good until the last drop, i.e. no fading as you wear through the pad.