I have two of them and have over 3500 rounds through the pair. No malfunctions and incredibly accurate for a gun with such a short barrel. Everyone that has shot mine has really liked them.
I dont know what generation gun you have but on my 3rd Generation DA/SA PT-145 I use the Trijicon's and love them. I got them here:
Trijicon TS01 Taurus 3 Dot Front and Rear Night Sight Set for PT Models 111, 132, 138, 140 & 145, TaurusTS01 SHIPS FREE on orders $29.95 & up