800/8000s are the same way....bulletproof as can be and can lug a big bar all day and just plain cool but just not an attention getter....I'm gonna give this one my best shot....echo really had it figured out with the 45/4600s of this generation....them saws will really sing....it's funny they didn't work harder at the bigger saws.
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http://opeforum.com/threads/dolmar-421-husqvarna-242xp-hybrid.4336/
Have a 4600 thread started, hopefully get it finished up later this week.
Might give me some insight for the next 6700/670/8000 build.