A friend and I have had supers on new Alphas since mile one. They are a bit tougher on fuel to begin with, but once you realize you can ride them at 1/4 to 1/2 throttle in most situations, they aren't so bad. We run the Mtn Addiction 3.3 gallon gas cans on them and fuel hasn't been an issue. Running 91 non eth at 6500-9000 feet.
I've been running all kinds of different turbos for the last 10+ years... Apex on 21 lbs, Silber turbos on the Pro and the XM doo, Impulse turbo on the XM and the 850 doo, etc. I can honestly tell you that if this supercharger cost 10 grand it would be worth it over any turbo kit you can buy. And as far as the price goes, you do have to remember this thing is running a full snow/water/air intercooler (hottest I've seen the IAT is 50 degrees, that's ridiculous), full ceramic coated pipe and can, and the CORRECT clutching. There's some content there that other cheap turbo kits just don't have. They are fueled better than a stock sled. No hiccups, burbles, bogs, NOTHING. They will demolish a stock sled out of the hole and make any turbo look damn silly. Imagine riding a stock sled with 60 more hp AT EVERY RPM, not just the top end like a turbo. I would think a well tuned turbo running the same boost and having a fresh run (everything cooled down) would maybe get it on the top end at 9000 feet, but it would never catch up to the supercharger to find out.
Anyway, as you can see, I'm a happy camper. This is the most fun I've had on a sled in years. The Alpha is a home run and the super just makes it so good it's hard to describe. They are loud, I don't mind the charger whine at all so I think that has quieted down some from the pre ctec versions. But when my buddy crests a hill with the pipe pointed at ya it's painful. The exhaust note isn't bad when you are on it though. Long story short... money well spent in my book!