I have installed a couple Dawson front sights on my 2.0C. I know a few of the guys in our unit that have installed the full sets. Of course, we install a LOT of sights, so it's not the same as someone who hasn't done it very much.
All that said, I really like Dawson sights, but they usually come large and need filing to get them where they fit tight but not too tight. The first set I did went great... judicious filing of the bottom of the sight dovetail allowed it to fit snug (general rule is once the sight will slide in about 1/4 TO 1/3 of the way then start drifting it in). Problem was the pistol still shot high. I ordered a new front sight and that corrected the elevation issue, but I took just a hair too much off the bottom of the sight and drawing from the holster caused the sight to drift. My fault.
So... I installed factory sights again because I can be very stupid.
I have Dawson sights on several other guns, most of which I installed myself with great results. That said, if you're not pretty experienced with gun stuff and a file (and/or willing to re-order when you mess it up... like me), I'd send it to Dawson. I'm sure they'll do it right.