The GLO cover is the only one I would buy. It's not expensive at all, and the optional 1/2" midplate is 

Welcome Visitor! Please take a few seconds and Register
for our forum. Even if you don't want to post, you can still 'Like' and react to posts.
I was skeptical about cast too until I saw this http://www.youtube.com/watch?v=0G5upBGBej0I'd stay away from aluminum or cast covers if you plan to play in rocks much. I can't say much though, I've got a Rockcrusher on my 8.8.
Negative, no fill plug in the cover which the the only downfall of the Riddler I think, but it's probably stronger without it.hey hahns since you have yours and i just ordered one of the riddlers does it have a raised drain plug or not just curious