1. Got it on a pretty good sale - $450. Still pricey but a little less crazy.
2. Tried the AR but, a) didn't like the tighter fit, b) didn't like the shorter length, and c) wanted the extra insulation in the SV, and d) wanted an insulated hood. Also looked at the Sentry a while back and while I don't recall all the reasons that I rejected it, I do remember that I like the SV a lot more.
3. Not terribly concerned about voiding the warranty. I'm pretty easy on clothing. Have purchased quite a few quality jackets during the past 30+ years and never needed to use a manufacturer's warranty.
4. Finally, a roll-away hood may be useless, and annoying, to some but I find it a nice "option". For those who don't want it stowed, just let it hang loose.