I strongly urge you to cosider Meprolites or Trijicons. I have had PT's on 2 pistols. The first was a Para Ordnance P14 Limited. The PT's were barely visible in the dark. I wound up trading the pistol on a SIG 226 .40 caliber. My latest pistol, a SIG Sauer 225 had green dot PT's on it. A friend had them installed shortly after buying the 225 (about a year ago) and sold it to me recently. The PT's are VERY dim. When I compare them to my SIGlites on my 229 (about 4 years old now) they do not compare.
As soon as the holidays are over, I am having the sights replaced.
PT's can be found for very good prices on the net and have a good warranty policy. You can save a little money now and deal with the hassle of sending them in later.
When I purchased my current duty gun, the dealer had put PT's on the gun (thinking that I wanted them) mistakenly. They offered them at a discounted price to avoid the hassle of removing them. When I found out they were PT's, I refused to buy the pistol until the night sights were removed.
My partner had PT's put on a Para P12, they were terrible too. I don't know how they manage to stay in business.
YMMV, but my opinion is stay away from them.