I had the fab-u-motion...then the motherboard on my machine died...repairs were outrageous...so then i tried several machines, and believe it or not, a fairly cheap brother changed my life! it has a slider that sets the speed, and it improved my FMQ 1000%...i think the singers have that slide speed control, too....it is a super way to go! I haven't used a foot pedal in 2 years, and not looking back! You can use a foot pedal with them...but it is such a blessing not to have to...I am 58...learned to sew in 4-H at 9....sewed with a foot pedal for 40+ years..but learned how not to very easily!!! So much easier on your back..it's not stitch regulated, per se...but the speed is..so all you have to do id regulate your hand speed...unbelievable!!!!
the model I have is brother sq9050, but as I said, there are other brothers, and singers out there that do the same thing.