My experience has been they are heavier than Port Orford Cedar, and are really tough. At my draw length my "standard" arrows made of POC would weigh 425-450 grains or so. My Doug Fir Surewood arrows usually weight 520 grains, give or take a bit. (29" back of point, 3 5" shield feathers, 125 head)
The biggest thing I like is they are tough. I don't like to put time into making something and having it break easily. They seen to recover and fly just as well as POC.
In the interest of full disclosure, I have used POC, Sitka Spruce, Doug Fir, Aluminum and Carbon to make arrows. I use Surewood Shafts almost exclusively now.
RonP