Hi OP. I have one of the PC Shields with the Hi Viz sights; overall I like them a lot. I prefer fiber optics in most cases, as they work well for my eyes.
Now the indoor range i spend most of my time at can be pretty dark inside (depending on lane choice). So if my Shield sits in my dark safe, travels in a case, and then is in a darker lane; well the front pin is not overly bright. For those times i just back up a foot or so to get myself a little under the table lighting; that can work wonders.
Outside, they work great.
I intend to let my Shield sit out in the light for awhile before i hit that range next time; just wont be able to report back on how that worked for a couple months as it's a Gander Academy location and well, its not opening back until later in the year.