Monster Draw played passively on flop

[DavidC]

Live 10/20, second lowest limit at the room.

4 players limp, I complete T[img]/images/graemlins/diamond.gif[/img]9[img]/images/graemlins/diamond.gif[/img], bb checks.

BB is a relatively new player to the room and seems a little too loose and pays maybe a bit too much post-flop. The CO is fairly aggressive and possibly a losing player, seems a bit loose.

Flop: A[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] (5 sb)

I check planning to checkraise, bb bets, everyone folds back to me, and I call with a likely equity edge in order to improve my implied odds. Is that reasonable?