I tried some on my xcr with minimal success. Gave about 20-25 deg F higher at low RPM (about 30F increase with mid tension Carbon Tech reeds). I ended up trading them and running Boyesen reeds with better success.
The XCR 600 triple/triple was always a problem sled from the factories. It was very short on low-end power, so for me it was good. I doubt the new domestic twins have the same restricted crank profile as the XCR 600. If you don't have low end problems, I would stay away from them. If you do, they offer only slight improvement. Your money could be better spent elsewhere in my opinion.
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