I had an HQ16 sit down model I put on a frame I already had. I eventually upgraded to a used Gammill, but I LOVED that HQ! She was a work horse. I sold the whole Kitandkaboodle to a friend who quilts the HECK out of that HQ. She is still quilting along!I would advise test driving one. You will see soon enough if it is a good fit for you.
PS straight lines on ANY machine with a hopping foot is a learning curve for sure! That is why long armers charge more for SID! You should see me try! OMGoodness! Its a HOOT! Tongue out just so,worry lines working , and a death grip on the handles. I need a glass of wine! lolol