My Janome 6600 loves monopoly and I've used both Mettler and Superior. I only use it on top and only for ditching my quilt, so just put the thread/colour I plan to use for FMQ in the bobbin, so it matches when I switch over to FMQ. I've also used monopoly on my Sweet 16 in the same way without an issue. Back the tension off a little bit up top and you should be good to go. If I use a spool of monopoly, I just put it in a jar, instead of on the spool holder, then thread into the machine as you noramally would, and it bounces around however it needs to, otherwise I end up with it all wound up tight. Use a thread net on a cone to keep it under control off of the thread stand.