Idahohiker wrote a review of Arc'teryx Alpha SV Jacket - Men's on March 11, 2012
It's heavy, and crinkly...but very tough. I recently slipped and fell on asphault and ice, my North Face ski pants tore, but the Alpha SV was untouched....
Heavier than the Alpha LT, it may also provide slightly more weatherproofing, although both use Goretex Proshell. I find myself bringing the LT along more in the backcountry, and perversely using the SV for alpine skiing.
I don't like the lack of pockets, or the placement of the pockets that do exist...but here again, its a compromise. The lack of pockets make using the jacket with a pack easier, and don't interfere with the hipbelt.
In terms of fit, I'd call it true to size. But, if you are going to use the SV in winter, and may be wearing a thick down or fleece under it with other layers, you need to go up a size. Remember, with the SV you have 3 inches in chest size difference per size. But if you buy a bigger size for spring summer fall, it fits like a gunnysack. You're at $1200 bucks to get two sizes of this beast, so just know what you are getting into here.
Is this jacket worth the obscene price? Probably not. But then again, you pay a lot more for a lot more durability, and of course, the Arc'teryx name. For most 3 season use, it is worth looking hard at the Alpha LT, which saves weight and about $100.