His one appearance this season, he was unable to cope with the abilities of Nick Powell. Last season, my impression of him after watching the 20 or so appearances was he's a poor defender, poor in possession and a one dimensional footballer.
He has a few good qualities, he has good pace and likes an overlap, yet I struggle to think of a time when he has created a goalscoring opportunity.
My opinion of Cash is very different. I see a very aggressive defender who is top of the league stats for interceptions, which means his positioning and reading of the game is top notch. His work rate is excellent. His passing statistics are accurate. His decision making has been good, but I was disappointed with his decision to hand ball in the Southampton game. I'm also slightly disappointed with his attacking play, I thought he would be getting forward far more often, but when he does get forward I think he looks dangerous and makes the right decisions, for example he was excellent at getting forward Vs West Ham and Sheffield.
Pangloss said above that Cash will never join a club bigger than Aston Villa. I disagree. He's already in the top five right backs in the league at this point.