Same experience for me
$ ps auxwf |grep compiz$ user 3594 0.4 22.8 1992436 1400264 ? Sl Jul31 36:00 \_ compiz
Version: 11.04 natty
ii unity 3.8.16-0ubuntu1~natty1 ii compiz 1:0.9.4+bzr20110606-0ubuntu1~natty2
Same experience for me
$ ps auxwf |grep compiz$
user 3594 0.4 22.8 1992436 1400264 ? Sl Jul31 36:00 \_ compiz
Version: 11.04 natty
ii unity 3.8.16- 0ubuntu1~ natty1 bzr20110606- 0ubuntu1~ natty2
ii compiz 1:0.9.4+