Yes the Campagnolo Centaur MTB groupset was/is very heavy and quite over-engineered for its' time (the brake levers a case-in-point). The hubs are still running great after 20 years of abuse. The ratchet on the click-shift thumbie for the rear gear broke years' ago and so gear changing has been in semi-friction/guess-work mode. I have obtained a pair of NOS thumbies now and must get them fitted. Like a lot of things-Italian, the thumbie and brake lever brackets, being steel, are prone to rusting (and mine have). I couldn't (yet) make any comments about Campag MTB rims as I originally had Mavic M6 Oxygenes fitted to the Overburys (and later on the Dyna-Tech). It's only in the last couple of years, and thanks to t'internet, that I managed to obtain a pair of Campag Mirox rims for the Dyna-Tech and they have yet to have had much abuse. I also recently got a pair of Campag K2 rims for the Dyna-Tech MT5 I have, and they look 'Sweet'.
Currently Owned Cycles
1990 Dyna-Tech 2070 (Team Colours) http://www.retrobike.co.uk/gallery2/mai ... ewsIndex=1
1992 Dyna-Tech MT5 http://www.retrobike.co.uk/gallery2/mai ... ewsIndex=1
1989 Carlton Randonneur touring cycle (Raleigh SPD) http://www.retrobike.co.uk/gallery2/mai ... ewsIndex=1
1990s Pashley WorkBike
1926 Gents' BSA Single-speed. 28-inch wheels
1930's Gents Sturmey-Archer 3-speed. 28-inch wheels
1950's Ladies Humber Sturmey-Archer 3-speed.
1960's Childs Phillips single-speed.