I have an update to this going up today. I love the images in V1, but I wanted to do some more tests using a glass ND filter. I also tried out the 720p60 mode on the 60D as well.
This lens is great. Note that I had a Lee ND .9 filter in front of the lens, which is a resin (plastic) filter :(. While it works, it also seems to soften the image a bit. That said, the Vivitar seems to render wonderful glowing highlights and diffused bokeh. Stuff you can't get with modern glass.