I am considering buying either an Atik Infinity or Starlight Xpress Ultrastar and am somewaht dismayed to hear of some people's experiences with the latter (does the Atik Infinity produce similar results?)! I would have thought that my Meade LXD55 SN10 scope would, at f4, be fast enough (in my opinion) and with a large enough aperture to gather decent images from my light polluted back garden. If I use my OVX8L, which at f6 and smaller aperture, I wouldn't expect results to be quite as good, but I'm not an expert in this field.
I've seen results from a member of my astronomy group (RAG) whose small scope with a Phil Dyer camera attached has produced (in light polluted skies and from behind double glazing would you believe!) in a relatively short exposure time quite bright B&W images of objects that he's always struggled to see even in big scopes in reasonably dark skies! This he said is the main reason he's so happy with it. I would expect that either the two cameras above with their much more sensitive chips would produce even better results?
I'm not into imaging as such, but was intrigued by the cameras which would enable me to observe faint targets from my own back garden without having to lug my gear about over large distances to try and see them properly. My rationale since seeing the cameras is that if I was to become really interested in imaging then I would invest in a specialised camera and associated gear. Of course convincing my wife that the expenditure was justifiable would be a different proposition!