I recently installed two DD LPKs and was quite impressed by the quality of the parts. Under 5X magnification the sear surfaces are very smooth with minimal machine marks. I haven’t shot either nor, of course, tested these long term. However, I have dry fired them many times and the feel is very silky- among the best out of the box standard triggers I’ve played with to date.
Grant’s LPKs are wonderful as well. I haven’t ordered these with the FCGs, but the other parts are definitely GTG.