The motors I have here are pretty good for the purpose.
I am using them here, also for
another small mount, and focusers (links are
here and
here).
They are definitely not good for high(er) loads.. they are designed for moving light things only (somewhere I read originally they were used for directing air flow in cars and aircons).
But with suitable transmission.. could be used for many applications. Especially because they are cheap ans small.