All right. Reporting back after using the Speck Candyshell and Incipio Feather with the BSE (Front and Back).
My assessment is a qualified "OK."
Qualifications:
1. You are VERY careful / OCD type persistence putting the case on.
2. You do NOT plan to change cases often, if ever.
The cases fit and look fine. The Candyshell you wouldn't even know it's there.
In the Feather the coverage for the exposed bottom is welcome. However, the BSE is thick enough that phone rises above the edge of the case so the screen juts out a bit. It was originally flush with the front of the phone.
Both cases are very very tight with the skins and putting them on or taking them off putts a lot of stress on the corners and edges.
So, if you're going to do it. Put the skin on. Wait a couple DAYS for it to completely dry. Put the case on very carefully. Don't take it off. You're good to go!
That's my take.
-Terry