I'm in the market for a new sled next year. I don't know if the Etec is a clear cut choice or not. First, there is the $11,200 price tag for a Summit X 154 or the $12,500 pricetag on a Summit Freeride 154 that is in the race chassis but 30 lbs heavier than the Summit X 154. The high horsepower rating isn't always the best, Doo revolutionized the 800s when it introduced the 800r in the 2007 model year Summits, that motor was a nightmare in 07 and for part of 2008. In this case bigger isn't always better.
From every report I've heard from the individuals who have ridden them they are a strong motor, and the 163hp number is not a myth, as they've been dynoed at a few different perfomance shops with that amount of power. However, the Etec 800 isn't a proven powerplant yet in my eyes, in fact, I don't even know if the reliability has been proven in the 600s from the few individual reports I've heard.
At this point the 2009 and 2010 800r, in my opinion are proven powerplants. A set of reeds, pipe and can, and mild porting will put a carbed 800r at the same horsepower if not more than a 800r Etec and you won't be a Ski Doo guinnea pig for a year.
I don't know why Doo uses their big selling point as the oil and gas consumption will be much lower. This is something that all manufacturers will have to be at very soon to fall within EPA regulations. If a person is buying a recreational machine and paying $10,000+, the oil and gas consumption costs are likely not too high on their priority list, I go into the season knowing I'm likely going to spend a pile on gas and oil and most likely others do too.
Finally, if you order an Etec with electric start a pull start with recoil an another $150-200 option depending on the dealer. It seems almost necessary even if a sled is bought with electric start that the added expense of throwing a recoil on the sled is necessary. Yes, I know the sleds can be started from the clutch, but that's not always the safest or the most fun undertaking either.
This is coming from a diehard Doo fan. I've spoken with multiple guys who are contemplating whether or not they should keep their current xp summits or go with the 800r.