I recently sold my Vixen Polarie celestial tracking system and bought a Sky-Watcher Star Adventurer Celestrial Tracker. This is what it looks like with my Canon 60D:
Assembly is fairly easy. Start with a tripod which must be adjustable:
Add the Sky-Watcher equatorial wedge and adjust to the local latitude, then use a compass (with offset to get as close as possible to true south), whilst ensuring the wedge remains perfectly level. The compass I show in the picture below is a hand-held one, tied in place so I could hold the camera and take the picture:
Next, slide the Skywatcher body onto the wedge and tighten:
At this point, in a dark sky, the polar scope is available to accurately locate the South Celestial Pole:
Add the fine-tuning mounting assembly via the dove-tail:
Attach the camera and counterweight and voila! it is ready:
Check all connections are tight, find a target and start shooting:
The whole assembly is stabilised by an improvised counter weight on a rope, to reduce any vibrations:
It's looking good so far but the problem has been that since I bought it - nearly two weeks ago - there has been solid cloud through each night of the New Moon window, so I have yet to test in practice!