Amari Cooper for David Montgomery

10 team / 2 QB, 2 RB, 3 WR, 1 FLEX, 1 TE / 1/2 PPR league.

Got offered a trade where I would send away Amari Cooper for David Montgomery. I am loaded at WR and could use another RB, but I’m not sure if Montgomery is worth it. Thoughts?!

MyTeam:
QB - K. Murray, M. Ryan, Goff, Foles
RB - Conner, Gordon, D. Henderson, C. Edmonds
WR - T. Hill, A. Robinson, C. Ridley, A. Cooper, D.J. Moore, Lazard
TE - Ertz, Higbee

Thanks!