This is a big decision.
I had a HQ16 that I bought used, and loved it. I gave it to my sister when I bought a Q'nique 21". Would have gone 'up' with a HQ machine, but a new machine plus Pro-Stitcher was way more than I wanted to pay. My DH serviced the HQ16 for 8 years. All it ever needed was a cleaning and a bit of oil. I wish I could say that I was 'gentle' with the machine. However, I was learning quilting on it, so made my share of what could have been big mistakes. It worked in spite of me.
Ask whether it is stitch regulated - probably not - and decide if you need stitch regulation and inquire about pricing. (If you decide to computerized quilting, you will need stitch regulation.)
I wonder if it would work on your Inspira frame? That's another good question to ask!