Zooms have a fairly narrow field of view and can be quite variable in quality. If this is the cheaper Celestron one it is probably "okay" but not great. Depends what your expectations are.
I have the Orion zoom 7.2mm-21.5mm and it's better than I expected. See
http://www.iceinspace.com.au/forum/s...d.php?t=120682
What other eyepieces do you have already?