I'm not knocking plowing, I just don't do it. My Brother and I use the tillers.
Personally, I don't think the sleeve hitch disks are heavy enough to do any real work in freshly plowed ground and I don't know if you could get enough weight on one to get the job done either (others will disagree).
The cultivators, like you have pictured, do ok for keeping weeds down between the rows if you use them often enough and have your rows spaced far enough apart. Some of the more hardy weeds may be difficult to knock down with a cultivator though. But if you have a tiller... you don't need to cultivate, just run down between the rows.
We don't put in all that much garden so I go back a hoe around and in between the plants.
Here is part of a recent thread with some pictures of guys plowing and tilling.
http://www.onlycubcadets.net/forum/s...t=42344&page=2