A few people i know that have tried them say some (cant recall which make) are a bit uncomfortable on the neck due to the buoyancy of them and even worse if you have to look up for some reason. That said im sure some makes are better than others.
You CAN have open circuit/normal reg bailout (and can even carry a spare mask if needed) but your air consumption will be slightly higher.
For extremely cold water diving i can see them being near essential (and also for working in contaminated environments but that isnt going to be an issue here).
You CAN have open circuit/normal reg bailout (and can even carry a spare mask if needed) but your air consumption will be slightly higher.
For extremely cold water diving i can see them being near essential (and also for working in contaminated environments but that isnt going to be an issue here).