I asked the guru at my machine shop about it and he said basically the same as above. If you are not reaching in the 7k rpm range it really is negligible. I have a Canton pan which is baffled and that prevents the oil from climbing the sides of the pan from suction under high rpm. A windage tray would have been overkill in my case. If you have it, and can make it work without issues, use it. It can't hurt.