Taking advantage of having access to telescopes from iTelescope.Net, I had a go at M81. I do not have much experience in LRGB, as being a city boy I shoot in narrow-band only...after getting a taste of LRGB, I would love to have access to a dark site though...
Lum: 5 subs (bin1) x 300s
RBG: 1 sub (bin2) x 300s per channel
Full resolution:
http://www.astrobin.com/141558/B/
Thanks for looking.
Slawomir