I bought this tool in order to adjust a few watch bands.  Most of my bands are average width and are made by Seiko, Bulova, Citizen, etc.

The tool is largely plastic with a metal knob which moves the tray where you lay the band.  This helps you better align the band with the removal pin.  I didn't use the knob - more on that later.

The tool includes 6 pusher-pins which screw onto a rod which is in a plastic handle.  The rod has a lot of play in it, but that seems to be intended.

With some practice, this tool does work.  I would recommend practicing on a band you do not necessarily care about, preferably a narrower one.  You possibly will bend/break the first pinhead as you practice.

If you have an average to wide band it is more difficult to see if the pusher-pin and the pin in your band are aligned.  In fact, on my bands, I didn't use the tray knob at all because the band fit into the tray with very little room left, making it impossible to see the alignment, so I had to adjust the band back and forth by hand to "feel" and make sure the pins aligned.  I found it worked best with some help, so my son looked down on the tool and lined up the pins and I held the tool in place while turning the handle and he would tell me whether to keep going/back up....and we are both pretty mechanically inclined.

The tool does work though once you get the hang of aligning the pins.

I am not sure about the advertisement of two extra spare pins.  I didn't get any band pins at all, but got six pusher-pins.

I would suggest this if you already know how to use one, or are willing to practice a little with it. I am going to try another tool, a set that comes with a small hammer and some punches to see if that is easier to use.

In the end I was able to resize my bands, but I'd say this tool was just so-so as far as ease of use.