From personal experience, having instlled the NY1 trigger on a G21SF that I owned, I didn't care for it and promptly removed it. I feel it just made the trigger too heavy, though it did have a much cripser reset. The other thing that I didn't care for was that when disassembling, I had to hold the trigger back, pressure from the spring would force the trigger forward so it was necessary to physically hold the trigger back when dissassembling.
"That which does not kill us makes us stronger." --Nietzsche
Walther Forum Member #55