I think that the engine bars are a very mixed blessing.

On a road bike they are ok and I bought some for my XT660X recently, I bought the Givi bars. I have not yet fitted them for two reasons: 1. You cannot have both the sump guard AND the engine bars fitted together without making some severe mods to the sump guard, which would of course weaken it, and 2. The engine bars fit to the engine mounts, and I am not so keen. I bought them so that I could fit my extra driving lights, but I am having second and third thoughts.

Also note that if you will off road, these engine bars add width to your bike and that is often a major problem and can mean your bike will catch on trees or whatever you are passing so a slim bike is a major advantage. My Beta 200 trials bike is ultra slim and I would never fit any engine bars, as it is designed to fall over without damage (and I have tested this aspect many many times hehehe).

Over to you!!!! Have fun.

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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....