Got me some nice new Ultegra 6700, I have looked after the 105 5700's so should fetch a good second hand price, only new in May
It's a great price for them both. Have the 105s bought from them as a gear kit with both mechs & cables for £182 two months ago. It's a fantastic drivetrain - full 105 - for the money.
Having said that I run a few bikes on a combination of parts & I can't help but think that a lot of it is marketing guff. The price difference betwen the 105 & Ultergra full drivetrain from them was about £200 for a roughly 200 gram weight saving - eh?
My vote for any bike is keeping it clean, well lubed & well maintained. I'm not a clean freak i.e. cleaning after every ride but once something starts feeling off or squeaking, generally a good clean, lube & tighten will sort it.
Having said that, off to clean the bikes with this £9.99 delivered & cashback via TCB or Quidco
http://www.evanscycles.com/products/fenwicks/fs1-cleaner-concentrate-ec020494 THE best cleaning product IMO.
Use it neat in chain baths / on drivetrain & dilute with water in a spray bottle. Lasts ages.
HTH