I bought a featherweight for piecing. I chose it because it's strong, easy to use and maintain, and of course portable. I picked it over a modern machine because of cost and I expect into live longer than anything I could buy today. I have a modern machine with many bells and whistles but find myself only using the fw now.
My dad gave me my grandmothers 15-91 in a cabinet that I have big FMQing plans for.