Re: Brian "brain" Mantia
wide open pocket is a very good way to describe his strength. The Brown Album by Primus is my favorite he plays on. They recorded it at Rancho Relaxo and it has a very unique drum sound. I don't think anything was close miked and the dynamics are awesome.
I can definitely see how he wouldn't work that well in G'nR though.
Also worth checking out is Colonel Claypool's Bucket of Bernie Brains. It's Les on bass, brain on drums, buckethead on guitar (was also in the G'nR reformation) and Bernie Worrell on keyboards.
Hell, I'll pick up that Brain's Lessons dvd and get back to you guys on how it is. If anything, it will be good for a laugh.