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It runs Bulhman 16 rather than RGBM and supports mixed gas. That is the improvement, but too late for me. I sold my Icon before the Genius came out and bought the Teric. In hind sight, I made the right decision. Nothing against the Genius, but they said for years they would upgrade the firmware for the Icon and instead just discontinued it. I don't think Shearwater has ever just stopped support on their computers. Also, those Mares computers are too big, IMO.
We've been having issues with our Icon HD where the pressure signal from the tank module/transmitter will stop during the dive. The battery level is good, and replacing the battery doesn't entirely resolve the issue. It will work for a few dives, and then reverts back to losing the pressure signal. I'm trying to see about getting the firmware for the tank modules updated if they contain down rev'd versions. If I'm not able to get the firmware of the tank modules updated, I'd be willing to try the 'Quad Air LED Tank Module'. The Icon HD dive computers have version 4.2 firmware.
Has anyone actually paired an Icon HD with the newer LED Tank Module?