Here's some thoughts to put out there for others ... IMHO this is a good offer particularly as it includes the Superior products. If you want more than one foot/ruler set and not double on the thread and holder look here -
http://www.punchwithjudy.com.au/shop/Ruler-Foot-by-Westalee-Design.html
For an online class specific to these feet/rulers -
http://www.punchwithjudy.com.au/shop/Westalee-Ruler-Work-Online-Classes.html
I have this foot and rulers for both my Juki 2010 (high shank) and Bernina 710 (mid shank, I think) - so 2 different sets.
The Bernina adaptor #77 is ~$12. The foot for FMQ is the best I have found so far. I purchased mine months ago from Westalee and the above site.
The ruler thickness specific to the foot is important (as there can be minimal hopping depending on your machine) and too thin a ruler could result in machine damage.