I would generally pump the performance data to a table. This allows a lot more flexibility in the reporting. If you need some kind of report you can use a reporting package or even just DTS it out to a text file.

Your article had an excellent conclusion. Based on it's title, I really expected a pro-sp_OAx article but was very pleasantly suprised. It's great to see someone taking time out to make decisions based on solid data and I think this sets an excellent example for the novices that come here to learn.

Kudos!