I've only seen one of the Mantis rests on a bow and that one had a broken support arm. I believe it was the left one. I entertained the thought of trying one just to see what it was all about, but that made up my mind pretty quick. IMO it's a pretty flimsy rest. I would choose something else.
I'm neither a fan of capture rests nor Blazer vanes simply because of the possibility of contact issues. I shoot mostly feathers but when I do shoot vanes they are the low profile sort. I don't hunt any more so have no need of a capture rest and rankly I never used a capture rest when I did hunt. Star Hunter is my all-time favorite. Old school? Yes, but it was simple and nothing could go wrong. I still use one at times.
If You're Not Living on the Edge You're Taking Up Too Much Space
Martin/Rytera Staff Shooter
PSAA Life member, UBP Life member
PADI AOW Diver