In short its a great combination. Tracking is very good and the starbook becomes more and more intuitive as I go. I did think about the expansion unit but I cant justify the cost. I do thing that the SXG half pillar is a necessity ( at least for me)
I had the SXP and upgraded to the AXD. For both I had the Advanced Unit of which I absolutely love as it's especially useful when using the setup on-the-go.
The Advanced Unit on the Starbook Ten eliminates the need for a laptop/notebook as I use it for both the guide scope (more a guide video camera), and intervalometer for my DSLR shutter.
The SXP/AXD mount themselves are nice to use - maybe not as silky smooth as the Takahashi EM200/400 series but smooth enough.
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