I want to purchase a sewing machine that has dual feed or built in walking foot or whatever it is that keeps you from having to put the walking foot on the machine so that both top and bottom fabric feed at the same time. I know that pfaff has a machine but are there other brands that have this feature. I have been reading about the janome with acufeed and superior plus feed system. Do any of you have a machine with these features and which do you think is best for sewing long strips together? Thanks for any info. Judy