I think he is a good player, at lease he can beat the rake, which means he is well above average. but a top-notch SNG player should be able to get a 12%+ ROI over a large sample. yeah, i think 5000 SNG is a large enough sample to calculate you ROI. but maybe your friend is still improving his game. i think on PP 215, 15%-16% ROI is about the max ROI you can maintain in a long run especially if you are multi-tabling.