I never did get comfortable enough in dry-fire with my P-09 using a Burris FF3 on a Springer dovetail mount to ever shoot it at a match, but having a milled slide makes a huge difference for me. I'm going to use my Urban Grey P-07 with a multi-optic cut P-07 Duty slide from CZ Custom at a match in two weeks and I'm actually excited.
I installed a CZ Custom 10mm height tritium front sight that I can line up with the vertical line on the back of the FF3 for a pseudo co-witness/BUIS (similar to XS Big Dot sights) which also gives me an alignment point of reference to find the dot quicker on those strong-hand only and weak-hand only transitions.
I can use this complete upper on either of my two P-07s, which makes it very versatile.
Competition Mode:
Nightstand Mode:
Co-witness with red dot off:
Co-witness with red dot on:
My very first shot with the new upper at 10 yards using just the front sight lined up with the back of the FF3 (red dot turned off):