Well, I've been extremely lucky. However, CL is not my area of specialty. Although I dabbled in and out of CL for the last 10 years, I've never really traded this instrument for any significant length of time. Of course, I plan to change all that since I dumped ES.
Ironically, ES and CL move in lockstep these days, so I'm essentially trading the same crap, different only in name. But the market dynamics are different for the two markets and that makes it more challenging.