My Stormlight weighs in at 12.0oz even. It is a size large. I just got it on the recent FL sale, so I haven't had it out to test it yet. It appears to be a nice lightweight jacket for intermittent rain like you'd expect to see in Colorado.
I have both. The vapor is definitely geared towards backpacking. The SEAK is good for heavy use (think wearing it for weeks on end). I can get some actual weights if you want.