I would be completely surprised if anyone could tell the difference above Tiagra level which is now the more than acceptable 6600 Ultegra level component that has filtered down. By the time you get to 105 the groupset is more than adequate by most standards and any higher verges on just saying I want an electronic groupset which is my case now. The advantages of an electronic groupset are near perfect shifts, never worrying about cross chaining and going up hills while standing on the pedals with the fear of dropping your chain and always perfect auto trimming.
So yeah to return to that... by today's standards I'd be happy to ride a Tiagra level or above bike without any real complaint what so ever.
Last edited by 1500SLR; 05-06-18 at 04:20 AM.