A 329PD to me is a lightweight defensive pistol that when needed will be needed with some speed. The factory sights match that need, so I'd be reluctant to switch it to a slower bullseye or slow-fire configuration.
I used mine for potting small game and saw it as much more than merely a short range defensive gun. I was actually pretty proficient with it on the 100 yard gong and similar so the sight upgrade made my 329PD more useful, to me. YMMV