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Works great for not having to re-solder batteries. However for GBA carts (or at least Pokémon Sapphire), it is just a bit to big even after filing down the plastic as much as possible since it has to sit on top of a chip. Thus the bottom of the GBA cart has a little bit of a gap, but this gap doesn't affect the cart going in or out of the console.
(photo without my finger was after filing down the plastic and one with my finger is before I did any filing)
For my GBA cart I give it a 4 of 5 but for the Game Boy and Game Boy Color carts it would be higher as they have more room.