Has anybody taken their Air 2 into actual cold water and lived to tell the tale? I am never really sure how strictly these cold water certifications should be observed, especially on a second stage.
In the early 1990's I would sometimes dive in a couple of Ohio quarries (Gilboa and Whitestar) and the Great Lakes using a gear setup that was perfect for MO/AK lakes and quarries. This gear included a Scubapro Mk 10 + G250/Balanced Adjustable + 3rd gen AIR 2, and Stabilizing Jacket (SSJ). Recreational dives. No issues whatsoever.
In fact, IIRC, I dived this very same gear (except, in a drysuit, rather than in my quarter-inch farmer John) during my first trip to Isle Royale MI (in 1994, IIRC), a four-day recreational trip aboard a six-pack, making no-deco air dives to a max depth of 140 [sic] ffw. No issues whatsoever.
ETA. I would strongly recommend, though, for diving in very cold water (e.g., in Lake Superior), use two complete cold water regs (two complete 1st stage + 2nd stage regs) and a standard power inflator. I eventually purchased Poseidon Odin's for my Great Lakes diving.
rx7diver