A big problem I had with the TEC was finding a barlow that would work with it so I could do Nyquist sampling with my images. With my old DMK the pixel size closely matched the resolution of the instrument so I wanted to increase the image scale about 2x. With the tiny (3.75 microns) pixels of the Skyris 445 series, there is no longer a need for a barlow. If you look at the solar images, done with a 3.5" Questar, there is granulation. Can't beat that for the aperture. On the moon I have done images to a resolution of 1km. This one of Copernicus is one of them with the measured craters in Stadius done with the LROC Quick Map images: http://www.lpl.arizona.edu/~rhill/images_moon/copernicus2013-10-15-0204finB.jpg
Several other things about this camera. The dynamic range is greatly improved so you can put the terminator and brightly light features in the same field and not lose detail in shadows or highlights.