Not for you if you run,
This review is from: Accessory Village Apple iPhone 3G/3GS BLACK Hybrid Protective Armour/Case/Skin/Cover/Shell - BLACK (Electronics)
I use various GPS based applications for measuring runs/cycle rides etc and bought this 'snap' together case as a replacement for a rubberised case that had stretched beyond recognition.
It wasn't the easiest of items to fit in the first place and the first time I came to take off the case to put my iPhone in my arm band all of the location lugs snapped off the case and thus after only one day it became a bin filler.
It is a sturdy case and I am sure that if all you want it for is to protect your phone it will do a great job. However, if you want to be able to use you phone for tracking runs etc/use it with arm bands/cycle accessories it is not the thing to buy