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I decided on the vixen polarie as I need to travel as light as possible. The polar scope works well and I have had nearly a 240mm fov for 4 minutes without any trails at 100% viewing. Of course, the main limitation is the 4 pounds weight (although some have put a mini borg scope on it so this is a conservative limit). Sometimes the camera can bump into it with extreme angles. That being said, it is the size of a vhs tape and can bear my camera body and a 70-200 mm f4. I can adjust the camera position without having to polar align again, but if everything isn't snug or you torque the system you have to realign. A geared ballhead for polar alignment is essential.
Here is one before moonrise at glacier national park.
Milky Way, 20mm f3.5, 3-4 minute subs, ISO 800, Astro modified T3i
Pleiades - Vixen Polarie, Canon T3i, about 150mm f4, cropped slightly