I have a Juki 98Q...it is straight stitch only. I read and read on the juki forum at Yahoo, and ended up buying mine without ever having sewn on one. I cannot tell you how much I love this machine. It has made all the difference in getting quilts quilted...I use it almost all the time. I had a Pfaff but let my daughter take it home...that after thinking I would never find a machine I liked as good as it.
I know the bigger space is what made the difference, but still, it sews wonderful, too. Several people on the forum have other, much more expensive machines and say they prefer the Juki for piecing...that it makes a better stitch than their other expensive machines.
I have a Viking that I kept for its blanket stitch...my Pfaff was only a tiptronic 1171 and did not have one. Also, I knew the Pfaff for her was better as it never has had problems.