Mine does stack a little bit, but I find that just continuously pressing the trigger through it's arc would lead me to some pretty unbelievable accuracy. It does slow me down at the end of the trigger press a tad, but if it's a longer or more complicated shot, I find that's actually rather helpful as it lets me clean up the sight picture before the hammer drops.
Shooting quickly, it doesn't seem to matter.
That said, my 686+ does have a nicer DA trigger (It's been worked on) and shoots about as well. Oh well. Both are phenomenal pistols and I like them both quite a bit.