The sigma 10-20s are nice bits of kit, but you have to know what you are after to use it properly. Im not as much into wide angle photigraphy as some so its not worth it for me, at least not at the moment.
Pictures look nice and clean, some show artistic thought on angle and the subject too
![Wink ;)](http://www.tekforums.net/Smileys/teksmileys/wink.gif)