I have a Hinterberg frame and a Viking Mega Quilter machine. I get along fine w/both but have never done a quilt larger than twin on it. I did quite a bit of research between it and the Gracie but since I have to take down the frame occasionally (when the DD's family comes - 4 boys) I like the Hinterberg for that reason. It is set up to be used sitting but I prefer to stand up - just feel I have more control and am more over the quilt that way. Of course I am also very height challenged compared to avg person!! I am able to quilt for quite a long time before taking a break so I would have to say it is comfortable for me to use.