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Believe it or not, the choice of AAS configuration can be a contentious subject, with strong opinions about AIRII type (inline-octo/LPI combo) systems vs regular second-stage AAS.
If you have the patience to do some reading, there are currently two active threads dealing with the debate:
http://www.scubaboard.com/forums/advanced-scuba-discussions/389252-why-do-we-hate-air2.html
http://www.scubaboard.com/forums/advanced-scuba-discussions/389475-comparative-debate-aas-configuration-options.html
The gist of the threads is that the procedures used with an AIRII are sufficiently different from a regular octopus, that they require further education. AIRII is an acceptable option, providing that the diver takes the time and effort to review an effective air-sharing procedure with the new equipment and ensures that this procedure is practiced regularly, becoming an ingrained, instinctive response (which all emergency drills should be).