I have the Imperial frame by inspria and really like it. I have a viking 18x8 on it now and really love it. I started out with the viking mega quilter on it which was nice but felt that I needed more quilting space. I kept my mega quilter for piecing and that has worked quite well. I think if I were you I would test drive the machines you are interested in as everyone has their own needs. I am pretty sure that the tin lizzy, pfaff, and viking are pretty much the same machine.