Harvey, you're absolutely correct. Walking feet are great, and for some fabrics practically a requirement. Pfaff's IDT system is fantastic, and of course there's always the option to use a walking foot attachment on most any domestic machine. Industrial machines like the Juki 1541 are workhorses for bag making, outdoor, and tactical gear. Fabric like Cordura, Xpac, and silnylon is slippery stuff, and can be a PITA to sew without a walking foot.