I wrote a review published with Curtis' first book. I also used his software Trading Blox for a decade. Haven't heard from him for a while. He has an ongoing war with Fake Turtle Covel.
He doesn't trade the same way he tweets to the group based on the private questions I asked him. I subscribed to him for about 1 year. Shorting VXX and similar products is a great strategy assuming you know how to trade, which I am pretty sure he does. But keeping < 20% of your money in those products at any time doesn't yield fantastic results, esp for smaller accounts. I personally found him very helpful and willing to share but I stopped subscribing once I understood the strategy and was willing to execute on my own methodology. I found his overall market read in his articles quite poor as his timing and risk / reward is typically terrible.