Forget specifics on the test mule, just think of it as a big C Coupe or small S coupe. What's not to like?
They may look similar but will be very different cars in terms of luxury and driving dynamics no doubt. For example, C saloon and E saloon have very different feels about them, although may look similar.
I think the styling is on point at the moment. I've always been a fan of the GLE coupe, now love the GLC coupe, the new front ends look great on the small car range and the back ends look great on the coupes - although many others disagree.