hornbow, listen to what JRW said about using WWs. Unless you shoot a high poundage bow stay away from the big snuffers. A big hole isn't any good if it doesn't penetrate!
Once you get the Hang of it, snuffers are easy to sharpen. Just a wide file and a sharpening steel. The key is not using too much pressure!
From Wenselwoodsman.com are the sharpenig instructions
http://www.wenselwoodsman.com/Sharpening.htm