Very interesting!!! I have an X fitted with Leo Vince pipes and I recently fitted a Givi set of frames and also Givi Trekker aluminium boxes
see http://www.givi.it/Valigie-laterali/...TRK33N-TREKKER
My travelling is road and no off road, recently a 5 day trip round Sardegna for instance, the luggage system was great with plenty of capacity and I also bought the internal bags they sell http://www.givi.it/Bauletti/optional/T484 so when you arrive you leave the cases on the bike and just carry the bag which is much easier. Givi is not cheap, however!!!

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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....