Does anyone use this BC with Nitrox? Am I reading the manual incorrectly? It says.....designed and constructed exclusively for use with compressed atmospheric air. Do not use this Mares BCD with other gases or with oxygen -rich mixtures. It goes on to say that a conversion kit is available for installation by your dealer...........but if you go back to oxygen......you have to have the conversion done again before using nitrox???? Really........????