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Another AT user here.
Roger has said everything very well.
I do use the polar scope, from a dark location it's easy to find the trapezium near Sigma Oct and then the alignment is very accurate. From a light polluted place I use the C&P method (compass & pray).
I've done up to 3 minutes with a 135mm lens and 5 minutes with shorter focal legths even with a very very raw alignment.
The best about the AT is that you can setup in 5 minutes.
In a recent trip we did some tests and without guiding the AT is more accurate than 2 EQ mounts we also had.
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