Baby hammocks

I have a dilemma. My in-laws saw something on Facebook about baby hammocks being awesome and reducing the risk of SIDS. I’ve done a little research myself and I had no intention of ever getting one because of the possible dangers (and there’s no evidence they actually reduce SIDS).

My in-laws got us one and seen really excited about it. I don’t want to seem ungrateful but I don’t want to use this hammock! Should I just accept it quietly and never use it?