i have Shimano Ultegra 6800 front and back on one bike. On another bike I have 105, but not sure which model of 105 I have. "My 6800 Ultegra brakes are much better than my old 7800 Dura Ace brakes." I know shimano claims that 6800 is improved but when i talk to few people at my LBS they all said that 7800 is better braking power. Overall I feel 105 is much cheaper and equally good(if not better). I am not very pleased with tektro. Yes the price is great but it I feel more secure with shimano.