Some very intriguing designs! #50 logo catches all the elements of the n, the 1, and the equals sign. Never been much of a fan of yellow. Red, blue, black, silver, even green may work better. Don't like the line thru #45, makes it look like the printer is not working properly!
I like the words "performance products" hidden behind the "q". Writing "nequalsone" without spaces, but with colors and/or caps to distinguish the words is very catchy.