i find that hte image HITs are quite difficult to do. Matching the images with the names. They do not pay you enough and on some the time is too limited.
I did try a few when I first began Turking, and to be honest I found it too frustrating, too time consuming, and I just did not like them generally. However, I have a friend who Turks and that's about all she does. She seems to love them and says they're a breeze to do.