I've shot various Carbon Express,Easton,Harvest Time,PSE,Beman and probably a few others I forgot. Truth be told,I can't tell much difference in any of them. SOmetimes I broke a couple and thought maybe they were a bit weaker than others,and then I'd put a couple more through hell and they held up fine. I shoot gophers quite a bit,which is very hard on arrows,what with all the rocks in the pasture out here.
I'm not a target shooter,so having arrows at .001 straightness vs .003 isn't going to show up in my shooting. Nowdays when it's time for a new dozen arrows,I start looking for sales. The best deal is what I come home with,most times. I did see some Carbon Impacts for cheap yesterday,but they are made in China so I didn't buy them. Maybe they are ok, but I haven't read much about them.