I suppose I might wade in on this thread. I got Anne-Louise a Starlapse this year after looking at what we wanted to get out of a setup. The AstroTrac was to be our first choice but as has been pointed out it is limited to 90 minutes if I recall. The Starlapse has the advantage of turning into a timelapse panning head, which was a key attraction for Anne-Louise. Weight was also a consideration and we decided only a few days before the transit to use the Starlapse with my WO 110 and Cano 50D. We were not well polar aligned, but I think that Anne-Louise only reset the viewing on the Sun 5 or 6 time over the 6 1/2 hours, and was pretty steady considering we had over 1000 kids and teachers tramping accros the basketball court where we were set up. At this stage I think it is great value for money. Can't wait until we can use it in anger
.
For a portable and compact setup and transport, I think the AstroTrac has it over most of the competition, it is very clever, but again I get a bit disappointed to have to rewind every hour and a half.