With superzoom lenses you win some you lose some.
What you win:
1) Convenience, don't need to mount/unmount lens.. Most of the time; this can also lead generally to a reduced need to clean your sensor in the long-term
2) Don't need to carry so many lenses
What you lose:
1) Superzoom lenses not as fast, so can have issues shooting in low light where a larger aperture is required
2) Optical quality
3) Distortion control
4) Some superzoom lenses have their focal lengths change at different focusing distances: http://www.cameralabs.com/features/18200_issue/
I would personally not use a superzoom lens.