I've got PTs on one of my guns, a S&W 669, and they are so dim that I've considered sending them back.
A friend had several guns with PTs, and is slowly replacing them (the sights) with Meprolights.
I much prefer Meproglights or Trijicons. In my experience, the Meprolights are much brighter.
PT prices are good, but I don't think you get a bargain. (Perhaps my experience is unusual.)