Yes they are with the 8". I've not tried with the DSI though I did try with the LPI a couple of times. I found I managed much better results using avies than I did stacking with the LPI, though I've seen some great shots here on the site from others using the LPI
Have you seen Chrissyo's shots of Saturn using a video camera and a dob here
http://www.iceinspace.com.au/forum/s...ead.php?t=6981