I have used POC with no trouble. I really like the sitka spruce shafts from Hildebrand. They are excellent, if a little bit lighter than most woods. I just ordered some more POC from Wapiti, and I expect excellence from them of course.
Really, as long as you are using pretty much any supplier on here, the PA forum, TBM, etc etc, you should be okay. Each wood has its own little quirks and peculiarities, but they are all servicable and effective. They are arrow woods for a reason, so the idea is to tinker with them untill you find something that grabs you. Some of us get grabbed a lot by a lot of different things. :D