I have thousands of camera jumps on Xaos, 21 and 27 cell. Everything from a 105 to an 84 and I absolutely LOVE the openings (when I pack it myself I was loading my xaos 88 @ 1.8 for a while and have noticed that since I donwsized to an 84 and have the wingloading more at @ 2.0 it opens even better and more consistently on-heading and soft! Yes the 21-cell and slightly more consistent opening but the 27 is awesome too!
Yes they snivel a bit, and sometimes they search around but who cares it's a skydive not a base jump!
I have jumped my 88 with lighter tandem style helmet setups and also with large 3chip video/still/flash setups and it's all good. Jump my 84 with a wingsuit as well!
have fun!