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The fact that you got one, saved it and put it back to use to your liking, makes it that much better!
http://i658.photobucket.com/albums/uu303/Wullie_01/silly%20shit/COWIE.jpg

The end result is the same. My take is that they are heavier. For me, they aren't as prone to hang, they just slice right on through the lip, bump, whisker or whatever is in their way. Just kidding,...

Kind of fond of the heavies myself
http://i658.photobucket.com/albums/uu303/Wullie_01/RAZOR%20STUFF%20II/Heavies003s.jpg

L-R
Frederick Reynolds 8/8
Frederick Reynolds 7/8
W&B 7/8
Harrison...