Material is fit for use as a watch strap, albeit not aesthetically complimentary when wearing it with your armani suit for brunch with your compadres (heckle at the toffs amongst the reviews), but more than acceptable for casual wear / sports.
Absolutely no chance of ipod coming free (i've just furiously shaken the watch strap with the ipod installed, its going no where, one review said it came loose - no chance, I may even claim wizardry was in practice, and even so I think Dumbledore would struggle.
No issues accessing the power port and headphone jack.
No issues utilising the sound up/down & power button.
There has been mention of warping of the silicone when the watch strap is over tightened,I rage at ridiculous reviews like this, hows about stop 'over tightening' it.
In summary, a great product.