I slewed to a bright star in order to focus using the Bahtinov mask I also got from Agena. To my surprise there was a little galaxy right nearby. Checking Stellarium, I found I was focusing using Mirach. So my first light is a 5 second exposure binned 2x2 or Mirach and Mirach's Ghost.
Here I have used Aberration Inspector in PI to take a look at how well the flattener is doing. There is a little elongation in the bottom left, but it looks like I got the spacing pretty close.
I then moved over to Messier 45, the Pleiades. It is a pretty severe test of optics because of all the bright stars. Here is a what a single blue 10m sub binned 1x1 looks like when stretched. There are some minor halos, probably from my filters judging from their size. If they were from the TS Flat2, they would be much larger in size.