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Autofocus is fast. Images pretty crisp. Probably the least expensive EF telephoto lens that you can get on ebay right now. Also, USM is just a superior technology to STM!
A bit of chromatic aberration. Also, it is so old that there is not a lens profile available within DPP (Digital photo professional - Canon's raw processing software). This is only a minor downside, most of the normal RAW priocessing features are still available, but you can't use any of the settings under the "Lens" tab.
Check out some sample pics on Flickr: https://www.flickr.com/photos/140777086@N05/albums/72157666002344362