I bought a size medium eVent Packa from Cedar Tree at Trail Days in Damascus this year. Weighing it just now it comes out at 16.4 oz, or 466 grams.
I got it in May, and just finished my AT thru-hike July 29th; I used the Packa as my pack cover and rain gear from Pennsylvania to the end in Maine.
But caveat: I hardly ever used the jacket part as it was typically very warm when it did rain that there was no point in having a jacket on (I used it as a pack cover a number of times). I did use the jacket part in summiting Katahdin, as there was driving rain at that point. I had it on at that point under my pack as I had a pretty stripped down pack; in that mode the pack cover part can balloon out to one side or another in the wind, but other than that it makes an okay sort of wind shirt/rain coat.
The coat part is indeed large, made to fit loose. Cedar Tree suggested that when it's somewhat warm out or working hard (sweating from going uphill) an option is to put your arms through the large pit zip holes and let the arms themselves sort of hang down. I did that at one point and it worked well --- I was able to keep jacket and hood on at a point where I otherwise would likely have had to take off a normal jacket.
I'm really mixed on this piece of gear; I live in the Pacific NW and I think I'll like it a lot here, but it is a bit heavy. Nevertheless in my very tentative and preliminary gear plans for the CDT next year I'm thinking I'll use the Packa.