Seems like a good price for an underrated lens. It gets good reviews on Flickr and Dyxum (Site for reviewing Sony/Minolta lenses). Although it is a 'budget' lens, it performs very well.
Listed on Camera Price Buster as the cheapest place to get one, Jessops comes in about 30 quid more.
Definitely worth purchasing if you're looking for a decent zoom lens on a budget.
Compact Design, All-Around Versatility: This high-value 55-200mm zoom lens covers a wide range of medium to long-distance telephoto applications -- and its lightweight design lets you leave it on-camera or carry it easily as an accessory lens for special purposes (35mm equivalent: 82.5-300mm).