My first eVent item, and it's incredible, I'll never go back to anything else. Ultra waterproof, ultra breathable. The only slight issue I have is with the fit of the neck. It's a little too big, and rain can come in there if it's coming down hard. I guess this is probably to allow for neck layers underneath, but I think it's too much. The jacket is incredibly light weight but still feels very durable. I haven't had much chance to test out the durability, but it's holding up phenomenally so far. Sizing is good for me. I'm 5'8" 155 lbs and the medium fits extremely well with some layers under it. A little larger than I would like as purely a rain jacket in summer probably, but it will be fine.

Just got the medium. Crazy light, can't speak to the performance or durability yet.
I'm 5'7" and lean (stocky) and I can get a long sleeve thermal underwear top and a smartwool short sleeve under it, that's it before clothes start to bunch up around my armpits/upper arms. If you're planning on layering and you're not pretty slender get a size up. The sleeve length fits me fine, the coat is not long (mid-way to side pockets on slacks/jeans. Had hoped to use it for winter as well, may need to return it (it's such a nice coat it's hard to send it back). I cycle and am really thinking about it for the bike, except for lack of reflection. I'm not sure I'd call the hood stowable, more like roll-able up-able. There's nothing to keep it in place except the tension of the collar with the zipper up.