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The Lumix 45-200mm lens was one of the very first Micro 4/3 lenses offered by Panasonic. It's range has been encroached (not fully in either case) by the newer 14-140mm f4-5.8 and the 100-300mm f4-5.6 lenses. I had the 45-200, and sold it when I got the two newer lenses. While the 100-300 is a superior lens for wildlife in my opinion, the 14-140 suffers a little in image quality as compared to the 45-200, especially at the longer focal lengths. I still have images from the 45-200 on my wall. That says something about the lens.
Because of its age (only), the 45-200 is remarkably inexpensive these days. You can find it used for less than $200 if you look for a while. If you're considering this lens, I would say go for it. It is a perfect companion to the kit zoom, and would be my recommendation for a second zoom for anyone on a budget, but looking to expand their capabilities.
Notice, I said "second zoom." I would always recommend the awesome Lumix 20mm f1.7 as a second lens, but it's a prime (fixed focal length) lens. The combination of a kit lens (14-45 or 14-42), the 20mm f1.7, and the 45-200 would make a relatively inexpensive yet highly flexible kit. It was my Micro 4/3 kit for quite a while (with the DMC-G1 body).