Agreed about the dome, yes its a pain especially if you want to zap around from place to place in the sky but it has the BIG plus in shielding you from the elements especially the wind when imaging.
My obs has a slide off roof and on days where there is a a bit of a breeze even, it always seems to get to the scope, even with wind flaps raised. Having a meade 12" fork mount, the wind is my arch enemy and it seems to win every battle. :-(
Standing inside a friends dome the other day I thought wow (and it echoed back).
My two cents
Regards
Bill D
www.billd.net