I just installed my Best Skins Ever skin last night (not the screen protector). I have a Crystal film screen protector on my screen (love it!).
The BSE skin went on fairly easy, and for the most part I am happy (wish the corners weren't exposed, even if just a little).
I was using an Incase sleeve, and my intention was to install the BSE so that it would protect the iPhone when inside the Incase. I also have a holster that fits the iPhone while in the Incase sleeve.
Now that I have the BSE on, I might forgo the Incase. I bought the Incase for two reasons: to better grip the iPhone and to protect it in a fall. The BSE improves the grip too, which in itself should help prevent some falls. But if my iPhone does fall--again--the BSE is not going to offer as much protection. OTOH, I like the "naked" look of the iPhone using just the BSE/Crystal film combo--and it's nice being able to use the dock again.
Finally, my Incase sleeve started to stretch a bit. I suspect using it in conjunction with a skin might help it "stick" better, minimizing any apparent stretching. I'll have to test that theory out when I get a chance...
BTW: I wish I had ordered 2 BSEs (it only comes with one skin). It took awhile for me to get used to the application process, and the area around the chrome could be better. It doesn't look that bad or anything, but I got fingerprints or something under that area from all the pulling and whatnot. If I had another BSE I'd probably do it again (but I won't try removing the one I have and reapplying it).
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Mike