I purchased the RRD's from C&S, but last night I found them for 1/2 the price at JBN (just by nature). Yes I do use them in the 464. When I used the Eco, they seemed to act like a fuse burning deep into the wax, I tried wicking up and the same thing happened. The RRD does mushroom a little but I don't mind it because atleast they pool up nicely.