I don't have transplanted hair but have about 1/2 inch of real hair.
I definately helps a ton as I currently have a pretty thick hairpiece that I do not need to expose the hairline.
Waiting for my Toplace unit to come whick hopefully will allow even more realistic hairline when combined with
my natural hair. Since my current topper is a bit too much density I can have issues with my natural hair moving a bit different than my system hair. Also when I sweat, my natural hair may tend to move down on my forhead and show a minor seperation from my system. I either swipe the sweat and the hair either up or down so it looks good.