Bought the Dawson night sights for my P-07. Installation was a pain in the ass for both the front and the rear. The front was wider than the factory front by about .13 mm, which is a whole lot. The rear was quite wide as well. A lot of filing was done. I was also shipped the wrong set screw for the front -- I received a very short one that when screwed in just falls through and is nearly impossible to get out afterwards. Honestly, given the existence digitally controlled CNC mills and computerized production processes, you would think these would be better fits out-of-the-box, without the need for extensive filing and overall alterations before mounting.
As far as shooting goes, due to the front sight being noticeably thinner than the notch in the rear one, azimuth dispersion is greater than for the stock three dot sights. Also it seems like the new sights (due to the front one) require more effort to place an accurate shot -- stiffer arms and more intense staring before pulling the trigger. Could just be me.
Overall, my personal experience with Dawson does not live up to the hype.