I remember having one that I bought on a whim when I still shot archery.
That barrel is such a large bore that you lose velocity just by passthru. Add the crazy amount of draw weight, it didn't really help.
I'm a small frame archer, about a 50lb draw and let me tell you, 220 FPS on a good day is too much work for me.
Just not my cup of tea, hope it is yours!