I tried both WPE, and enjoyed The Wolfgang Puck Express in the marketplace the most.
It seems to me that the one in the westside is like an addition to the Wolfgang Puck Cafe, which is a table service location with inside seating, but the Westside WGE didn't seem to have as many food choices as the Marketplace one.
It awes me that both of those WPE are considered QuickService by the
Disney Dining Plan (perhaps I shouldn't say that too loud?

)
I first went to the one by Cirque du Soleil, ie Westside WPE, didn't know there was a second one: no paper plates AND apart from ordering at the counter, it all seemed like a Table Service experience.
Ordered Carrot Cake dessert thinking to take it with me, but by the end of my entree I was full, and had already too many days of dessert (never thought I'd say that in my life

). Offered it to the couple at next table (it was in an obviously unopened container, & had been brought out to me after they had sat at that table)--I think I made the guy's night!
Going again in Sept 2011, with or without Free Dining, but sure plan to hit WPE Westside (and Earl of Sandwich) a few times.
FYI, I did have the Mac & Cheese, sadly I ws very unimpressed with it, but that is absolutely the only thing that got my thumbs down (but I miiighhhtt give them one more chance!)