Having used my star tracker for the past two months, I feel I can now give a worthwhile review.
I can honestly say that the MSM rotator has completely changed my astro photography and I’m now achieving the images I always wanted.
The kit is light and compact, easy to operate, and when used with the Benro 3-way geared head and the MSM laser pointer, polar alignment takes just a few seconds. Battery life is also very good, allowing longer sessions in the field. I've exposed images up to 2 minutes without any problems.
In short, the MSM star tracker is a game changer for me. A great piece of kit and real value for money.