Well here is my experience: I have owned 3 XT660X s over the years, cos I loved em so much. The first 2 I had lowered using the official Yamaha kit, whereas the latest one I did not lower. WHAT A DIFFERENCE!!!!!! The standard suspension is wonderful (when I fitted the Kev front fork mod) and I would never go near the lowering kit again cos it destroys the handling. When I was 2 up I would drag my feet on the road, that never happened with the standard version. And I am no giant but you only need to get used to the bike, you need to get one foot down not both.

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(Now sold on, sob) 2011 Blue XT660X with gold wheels, was 26,500 km.
Engine mods: K&N Stage 1 filter, DNA Stage 2 filter, snorkel removed, Kev fuel mod fitted.
Plus: smoked Puig screen, Yam aluminium sump guard, Yamaha / Acerbis handguards, Givi Trekker aluminium side cases, Leo Vince X3 cans plus Kev front fork mod and Fender Xtender. Just fitted Michelin Road Pilot 3 tyres.

SOLD the XTX for a Super Ten 1200. And just bought a Raptor 700 so staying on here for some tips....