I agree with joesmom....sitting and moving the fabric is so much easier on my brain than moving a Longarm would be..but that may be because I FMQ'd on my domestic for quite a few years before getting sitdown HQ16 Sweet Sixteen. I've had it more than 4 years and still love it.
No I can't do pantos... but there are so many more things I can do like ruler work that just didn't work on a domestic. And I love having the throat space and table space. I suppose I could have tried to get a table to drop my Elna into, but then that would have worn out my Elna. So I also get a much longer life out of my domestic (that is close to 15 yrs old).
So I don't regret getting a sitdown. However, if you have back or shoulder issues, a sitdown might not be for you.
eta : there used to be a dealer in Taylorsville. He closed his quilt shop though. That's where I got mine (I am on the SE side of Charlotte) I've not had any issues at all with mine needing any service, etc.