Yep...the bevels aren't very even....I use a belt sander to get them even. Once you do that, they are a cinch to sharpen....on a flat stone, file, diamond stone, or 'crock stick' type sharpener....and yes, mine DO feel sharp....like razor blades.
The key is getting thos bevels even before you attempt to get them sharp.
I usually pyramid the tip to make it stronger...easy to do while sharpening by simply raising up the rear of the head about a quarter inch while sliding them backwards on a stone, flat diamond stone, or file.
Snuffers are the same way...'wavey' and can be sharpened to a razor blade feel in the same manner above.
Never had a noisy one either, but mine are all mounted straight....I don't buy them with adapers already in them, I do them myself.
They do penetrait well, and are a great 'all around head' IMO....once you do your part.