Well, there you have t. Using my 112 dollar balls, was -5 after 6 holes in the St. Andrews qualifier. Didn't realise it was my last ball in the set until time to putt on the 6th and I was sent back to using starters.
Using these from there on in, was able to jump out to -11 before a dropped shot at the 14th and a 8 at the 17th followed by a birdie at the last (both bad holes caused by errors stemming from speed of shot meter) left me one shot shy of the cut with my best round there, a 65. This course is certainly tough, but I reckon half the battle is in the mind if I can make the results I did using starter balls.
Go for it, no excuses heeded bar the glitch (intentional or otherwise) where the shot meter speeds up even with the good balls.