Damn, that Primus one is so cool, gotta love Les Claypool's retarded voice.
I love Buckethead, but for a guy who has put out 50+ albums (Yes, that's right, more than 50 albums!), you can't expect it all to be pure gold. Some albums you should just avoid.
But if you can tolerate slightly emo vocals, download Botnus, great little speed riff and great solo, which starts fast and then slows down a little and becomes really cool.
Oh, and:
Buckethead's mask = Strangely enigmatic.
Slipknot's masks = gay.