I usually try to order at least one Refill Kit when purchasing the Card Kits so as not to run out.
I've used other Queen and Company refills, which were easier. This one was a bit harder, due to shape of butterfly. The butterfly acetate needs to be precisely attached to the foam or it requires trimming with scissors. Otherwise, it's a fun card to assemble. I still highly recommend this refill though. Much easier than making refills on my own.