TW, It would be interesting and helpful if you were to provide the high and low values (or maybe a std dev) of the rackets you test so we can see which manufacturers have the best quality control. I would be most interested in weight, flex and balance. It is frustrating to finally decide to buy into a new line only to find that the rackets all have different weights and balance points than the demo or the spec. I recently weighed three Prince Diablos at my club (all strung). The heaviest weighed in at 11. 6 and the lightest weighed 10.8! Can I specify weight or balance on my order?