I've seen him 3 times: once in Ithaca, NY with the band that did the "Passengers" album (including 2 basses: Swallow on electric and Eberhard Weber on acoustic), once in 1975 at SUNY-Binghamton (my only memory of this show is that the acoustics of the room were such that when Burton hit one particular note on his vibes, the reverberation shot through my temples like a bullet, and he kept hitting that note over and over; I had to leave the concert), and once at the Bottom Line around 1993 when he performed with Rebecca Parris to support their "It's Another Day" album. His peak for me were his early ECM albums: The New Quartet, Crystal Silence, Hotel Hello, and on through the Zurich with Corea album. Great, great stuff. Later on, he blanded out. This seemed to be his intent and vision, because if his later ECMs were bland, he then went on to GRP and a bunch of really bland albums. Ozone played on two of those bland ECMs: "Real Life Hits" and "Whiz Kids" - nothing terrible, but nothing really memorable either.