I have one if those tools and you’re right: it makes removing or adding a watch band much easier, especially in removing the little spring loaded pins that connect the band at the juncture of the watch.

For metal watch bands that I need to adjust the size I used to use a paperclip to push out those pins. But, recently I could not get those suckers out of a new metal watch band that my wife bought for one of her watches. Browsing on the Internet I found this watch link remover:

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Man, it makes those difficult to remove, force fit watch link pins slide right out … best $5 I’ve spent in awhile!

That’s a nicer spring bar tool with an angled tip that will give some leverage. I have a cheap straight one that is a bit difficult to use.

Be careful with the tools in the 2nd and 3rd pics. The pins at the tips are quite soft and bend easily. Make sure everything is lined up before applying pressure. At least, the cost of replacement is cheaper than having the work “professionally” done.