The bottom moulding does not take into account the psp go technically has four corners. The bottom left of the skin has a gap where the lanyard section is so the skin does not actually grip the psp shape. If you use headphones then this skin will keep falling off but your headphones will keep it attached. If you are not using headphones this skin will just keep falling off!
The top moulding is actually a very good fit. If the bottom part had been 100% fitted it would be a 5 star review but it fails to do what its supposed to do.