Great experiment! Sean showed up on time with his tool bag, the tune up is smooth as he gives me pointers on how to adjust my brakes, front dérailleur, etc. Sean even offered to clean my cig and chain and my bike’s drivetrain is practically new now! Test rode a bit and it was quiet and brake is tight. Thanks so much would definitely recommend to anyone! I have a BMC2015 Teammachine SLR02 with shimano 105.