I don't recommend snow caves at all. I won't risk my life inside one of those deathtraps overnight. I had one collapse on top of a me and a friend. We were completely trapped in the snow. The weight pinned us down completely, we never would have been able to dig our way out. The only thing that saved us was that we had 8 friends outside the snow cave who dug us out. If they hadn't seen the cave collapse, we would have been stuck. I was shouting at the top of my voice and they couldn't hear anything outside.

It turned out alright, but if we had been sleeping in the cave overnight when it collapsed, I wouldn't be here. Collapses are probably few and far between, but it only takes one collapse to trap you completely. The only situation I could see someone risking their lives in one of those is in an emergency shelter, life or death situation, where the risk is worth it. In that case, I can't see the justification of expelling all that energy, when there are easier, safer snow shelters which can be built.