Yeah, they do nice clean cuts. My only real knock on them, is I wish the glass was a little higher quality, because they do a pretty decent job with the rest.
I've hooked mine up to the j-hook I got with the @#$%ing $70 I had to burn (grrr). But, hey... it made a nice little Krave bubbler, so I'll take the optimist way out. I got to bring a glass accessory, that I've wanted to use more, into my arsenal, standing on its own. Win!