Cant comment on the G-Star havent used one, but I thought it was more focused on planetary, I am sure someone else will comment.
Other things you will need are a guide scope and guide camera. The QHY5/OrionStarshoot Autoguiders are popular, likewise the GSO 80mm short tube acro refractor, this can be had for around $600 as a package,
https://www.bintelshop.com.au/Product.aspx?ID=9054