Top 5 Speed.
Below avg toughness between the tackles.
Bottom 5 O-Line.
Great receiver out of the backfield.
Low RB1 in PPR, avg RB2 in standard.
Every time he gets the ball in the open field I hold my breath.
Every time he gets hit I hold my breath, b/c it looks like he's not coming back.
I say keep him if you got depth at that position, but if you can trade him for 2 quality lesser backs you probably should. Depth is important.
LeGarette Blount + Mark Ingram would be a good combo you might be able to fetch with Best + some filler.