For what it's worth, "word" is the new iphone (if there is a new iphone coming) is going to be a bit bigger so your case might work on that one when you upgrade (if any of the rumors are true) so having a case that fits more than 1 size is good.
That said, and I don't want to be throwing cold water on you, but I've learned not to buy the fancier cases for my techo stuff--it changes too much (heck, I get a new cell phone every 2 years). I spent $40 on a
Kate Spade iphone case and I knew that was too much, but it was too too cute. But your BV case does look nice and if your phone can't slip out, I would think that's ok because is is protecting your phone, which is the reason for these cases.