SGP is the centerpiece of making astrophotography "doable".
It's the least expensive part of my kit, and among the most important.
I don't even know if i can buy a spare cable for $100
I would pay full price for the upgrade and not think twice about it, including all the add-ons I bought
I can't believe there is a discussion of tens of dollars for exceptional software in a hobby that is orders of magnitude more expensive than that.