I finally got to test out my DA 300. I really like the lens so far. The only thing that I wish it had is a focus limiter. The lens is a little bit slower to rack through the focus range and this would help a lot. Everything else about the lens is great.
All of these were taken using the TC. After testing with and without I see no reason to not use the TC unless I need the f/4 aperture in low light. This is a really great combination. These are all stopped down to F/8 for depth of field reasons and not because I "had to." Here are a few of my test images.