I have a 15-91 that I LOVE for piecing and FMQ'ing! The feed dogs drop and it has a large harp space. Mine was given to me but I see clones often for $30 - $75. It would be a shame to trade your FW for that without getting some $$ also. What about just saving some $$ for a while and look for a nice, but inexpensive clone or 15-91?