its a tele zoom lens...
on 55mm u wont be able to take wide shots.
55-200 is usually used with 18-55
unless u have 18-55 or other wide angle lens, i suggest u consider the following
1. What are you lacking?
2. What do you need?
3. What kind of grade of lens do you need?
4. A need for VR? or no need?
These are the question you need to ask urself when deciding on whether to purchase the 55-200mm. Of course, before asking urself these question, you mus be sure of what you are going into. i.e. planespotting? portraits? birding? etc.