After I posted, I was talking to the HQ 1-800 people and confirmed ....
The HQ S16 is the same machine as the Tiara, as well as the Viking and Pfaff machines. All built by them ... all the same!
They also make the Babylock Crown Royal (and no other BLs).
I don't know this machine and didn't ask, but would suspect that HQ has their own model, which is basically the same.
So if you are buying any of them ... they should all be the same, as they are all made the same, just rebranded!