I would modify this and say "If a prebuy isn't done by a reputable shop - run, don't walk."

When I bought my Aerostar, I knew nothing about them. I literally found out about the airplane 24 hours before I owned it. I had 0.5 hours in one a decade earlier.

My IA (which had never touched one) and myself got it airworthy and maintained it for five or so years before I sold it. The reputable shop that it was taken to for the prebuy said the squawk list was significantly shorter than many that he sees maintained with an "open checkbook" at several big name Aerostar shops.

Like most airplanes, 90% of the maintenance is just common sense items. With support from AOA, the Aerostar Forum and Aerostar, most maintenance isn't difficult. Other than one or two challenging issues, they are just an airplane....

why did you buy it? Asking for my own knowledge- I'm looking for something practical for my family; and I have decision paralysis between another pressurized twin, or SETP (higher cap-ex).

The price was embarrassing low.

Looking at putting a GWX75 in my aerostar.
Does anyone know if it will hold a 12" antenna or only the 10?

I believe this has now been discontinued in favor of the GWX 8000 StormOptix.

I believe the GWX75 and GWX8000 are basically the same hardware with different unlock options on XI displays.

Garmin still lists GWX75 as a current product.
The unlock to add the fancy GWN8000 stuff is like 14K and
9K for ground clutter suppression... and turbulence detection....
(not sure if the 14K include the 9K, but given its garmin my guess is they are differnt.)

I installed a GWX70 with a 12” antenna into an Aerostar in 2016. The GWX75 is dimensionally identical to the GWX70. The GWX8000 is a GWX75 with a software upgrade that utilizes computing power in the GTN, GX000 Or G500/600xi to post-process the returns

The GWX8000 unlock includes all unlocks including GCS. I don’t know the current price but it was about $13K when I did it