I have a PC Shield w/ the Hi Viz sites and most of the time really like them. But at one indoor range I use (which is quite dim) after awhile they do get a little harder to pick up. Could be after a bunch of rounds fired (the porting dirtying up the front site some) or just the lack of light.
I am considering a combo front site, i think Tru Glo makes one with Tritium and FO for the best of both worlds. Haven't seen one in use though.
My other MP's are all stock white sights, that i used colored polish on the front dot to make it stand out.
In the pix, the Shield is on the left, a full size MP on the right. Not great pix so just for an idea.....