This product has already paid for itself. Dropped my Iphone 4 down the stairs onto tiles and not a scratch. The outercase is very protective but not too big and fits perfectly. The sticky screen protector also works well and a few months on its still invisable to me. To maintain screen functionally i dont see there is an alternative to a sticky cover. Also the side of the case protrudes just above the screen so that it doesn't touch when face down.
Only downside to this product is that the case doesn't allow most headphone jacks to be used - the slim iphone one does work though, but not big chunky jacks. Also same with docking stations, the case needs to be removed, but the standard connection on the wire does fit.