I dont use plaits very often in braid, finishing the plait can be difficult due to the amount of grip that braid has as it slips over itself. I tend to splice a loop into the braid for about 50-60cm. It seems very strong, and tends to fail in the main braid.
I do use plaits for heavy nylon, when I topshot nylon for heavy tackle. The memory of nylon makes it a very forgiving knot with a bit of spring in it.
I've post a pic with the spliced loop above, and a plait below.