I too like the 51's.
THey have a great look to them, with the large embossing on top as well as the large ICE COLD on the bottom.
Of all my machines that I show people the insides of, the 51 is the one that people are most fascinated with, and are always curious as to how it works.
What I dont like is seeing a 51 with the 2 white over red.
I prefer them all red.