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I had an older Beyza case and am considering the strap version of the one you have there. Slightly concerned that the phone seems to stick up out of the top of the case by a mm or so-I'd be happier if the case was a couple of millimetres taller than the phone, just to offer some protection to the top of the phone. The strap version looks like it will protect the top corners of the phone better though-they look very exposed in those pics of the non-strap version.
 
That's a pretty valid observation regarding the iPhone being exposed at the top, although its not something I worry about. It has a pocket to itself, and I need the top exposed to fit my mahoosive headphone jack.

I think the pull strap cases offer much better protection of the top, I have several iPhone 3G models from Beyza/SENA and they're pretty well covered at the top, as you don't need to be able to grasp the iPhone to remove it.

It's a shame that the iPhone 4 is a little taller, otherwise 3G slip cases would work a treat.
 
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