I paid a bit more for this than the competition's products because I felt like my ~$300 watches deserved to be taken care of. And that it did... You'll see that some other tools have only two points that the bits "latch" onto the back casing on the watch. Having done this with the 3-point system in this tool, my guess is that it'd be hard to get enough torque to get the back casing off. Likewise, getting enough torque when screwing the back casing back in would probably be tough too... I like my watches to stay waterproof as I do swim/dive with them. Anyway, the tool came in a nice box with many "bits" to chose from. I've only opened two watches and both have used the same bit. Just remember not to lose any! :)