The GM15 is very nice, but the wires are quite fine. Use a plug to make installation easier!
The GM15 25:1 geared pager motor is a tiny powerhouse, so you have to be careful with it. Instead of having to snip off the included connector, use this 1.27mm pitch dual-position connector to mate it to your project.
Mind you, it is a surface-mount connector, but then again, if you're building with such a tiny motor to start with, we're sure you can handle soldering this little connector in place.