The 200mm Macro is designed specially to support the Minolta APO converter 1.4x and 2x. With some test at home a few months ago, I have found that the 1.4x really increase detail, and the 2x is not bad at all too, but not good as the 1.4x. Basically it is probably better to upscale a 200mm + 1.4x than using directly the 2x (at least if you really want to be sure on what you are doing the focus in this very small depth of field).
So ... Here is some handle result of the 200mm F4.0 + 1.4x + MFC-1000 with the twins flash. I have managed to take all the picture only at 1:1 on the 200mm.

http://www.pbase.com/nadeauf/image/1248 ... iginal.jpg
Other picture also available on :
http://www.pbase.com/nadeauf/200mmf4_14xconv
The image has been took in RAW and converted in lightroom 3.0 BETA 2 with the new option to limit the output file to a specific size , in this case : 2500k. So, it is original size 24MP picture, with a kind of compression
For this first session outdoor, i can't wait to go outside again with this setup, for the moment I really like the result.
Regards,
Frank