For what it's worth, Felker Motorsports in CO did over 45+ Etec kits last year with viturally no issues...did another 10-12 the year before, in development. He has 3 customers that put over 3000 miles on them last year, trouble free. His personal 2011 Etec has 4800 miles on it boosted. I would say he has more Turbo Etecs on the snow than anyone else combined. Might be worth a call to them to verify his findings, as he has been a long time high altitude Doo tuner and repected racer,,having won multiple championships in snocross, drags, and also had 12+ I-500 strong finishes.
Both his son Calvin Felker and Carl Kuster rode his prepped Etec Turbos to top 3 qualifiers in Open Mod at Jackson Hole this past year.. This year they will take the past 2 years development and have an even stronger package for the new XM chassis. He also has a lot of inside knowledge and works closely with race dept. folks as he has been a long time Ski Doo dealer and racer.
BTW... he uses the Aero turbo... does his own install and a few other proprietary things for his customers only. Wouldn't matter what turbo he was using,, he would make it flawless regardless.
Be careful what you read on here, as there are a lot of politics, old lawsuits, personal issues and slanted opionions regarding Etec turbo packages..You can't replace true hi altitude tuning experience and results... which is what you would get with him. Over 55+kits on the snow and you don't hear anyone on here complaining about reliability or his setups, period. Just the facts.
If you have questions, there a lot of people on here you could email or call and ask them yourself what there experience has been...