对当前石油市场展期交易有效性的看法？

The volatility is definitely the main issue. Unless you're extremely nimble, it's hard to capture that roll yield without getting whipsawed out of positions on price swings that wipe out your gains.

The volatility is definitely the killer for longer-term plays right now. I've seen some success with very specific, short-duration spreads, but it requires constant monitoring and quick exits.