Hi Spocky
People will tell you that Self Guide is great or even indespensable but from where I stand it is simply not necessary. A good quality mount is very helpful though
I have used piggyback guiding pretty much for ever and I cannot see what all the paranoid selfguide hulabaloo is all about
Here are some comparative examples that should belay any fears you may have about passing up on a selfguided camera
http://www.pbase.com/strongmanmike20...94040/original
http://www.pbase.com/strongmanmike20...45498/original
http://www.pbase.com/strongmanmike20...05167/original
NB: Out of about 130 X 10min sub exposures taken over three nights for the full deep version of the above Centaurus A image, only about 3 or 4 were discarded due to guide errors!
Even using 15min sub exposures here is what piggyback guiding, when using narrowband filters so notorious for selfguided images , can do:
http://www.pbase.com/strongmanmike20...18593/original
Think about what these comparisons are demonstraing and make up your own mind
Mike