The one and only drawback for me is that you can’t remove / replace the broadhead easily. Thus if you want to put your arrows in a suitcase and travel, well they are just too long.
I usually go somewhere once a year and pretend like I have a chance at killing something. So I need to be able to break down the arrows for air travel.
Twice since 9-11 I’ve been asked to remove the broadheads from the arrows at the airport. Why? Who knows. But after that I just started doing it and packing more incognito.
If it wasn’t for the occasional trip, I’d switch to those one piece insert/adapters pronto.