The blue spot brakes are very good when working properly but you need to keep on top of the maintenance!
I only ride 6 months of the year nowadays but remove the calipers each winter,clean,check pads,check action of pistons, apply light coat of red rubber grease to exposed ends of pistons, copper grease to back of brake pads,brake pad holding pin.
I wouldnt disturb the seals unless there was evidence of damage-they should be replaced every couple of years anyway as part of the service schedule-for best results use Yamaha OEM seals. If replacing seals,check seal grooves in caliper body are clean & free of corrosion to ensure proper fit & smooth piston action.
Overhaul master cylinders with Yamaha kits. Also consider fitting braided hoses the originals dont last forever! Change brake fluid every 2 years. Result-excellent brakes!