It is rather odd, that it has shown to be less reliable than the standard trigger. The reason I say that is because of the fact it was designed by Glock and some high speed low drag folks at Quantico. I verified this as one of our guys was at the NA during the GPT's initial released, and I had him reach out to firearms guys while he was there, and got the word first hand.
It does provide exactly what it was designed for, a lighter less disturbing trigger pull on a Glock pistol. Unfortunately, it also degrades the reliability of the trigger pull as well.
I had a few of them I ran for a few thousand rounds, and never experienced any issues with it and didn't have any special cleaning rituals for them. I just cleaned it and lubed it like I do the standard fire controls and it ran fine. There are numerous reports of problems with it so I do believe it isn't a superior design by any means.
My biggest complaint with it, was the fact the trigger shoe itself is larger front to rear than the standard trigger, increasing the reach, especially for me and my medium hands. If it had a thinner trigger shoe or at least the same size as the standard, I would still have them. I know you can replace the shoe with a JG shoe, but I don't want a $150 plus non factory trigger in any of my duty pistols. YMMV.
TXPO