Ken, Nick is bang-on with his explanation of the stainless. With the the 310, jumping from the "E" to the "S" gets you the stainless lid, and door inserts. The rest of the Q and internals don't change. In this case, it's purely cosmetic.

Depending on how fussy you are, and how often you BBQ, you may get frustrated with the stainless exterior. It takes alot more maintenance to keep that clean shiny look.

Shawn

Epic 80/600 + M3's + M3 Algonquins + M2 Computer + EP125
I think I'm developing an addiction.