I'm still using it - and using it for the 24-hour stuff and brevets. I still get the empty-tummy hungry feeling after a few hours, but a few crackers, pringles or pretzels stop that, and the rest of my nutrition comes from the Infinit. I was planning on using the sliders for my blend, but they called me to help me dial it in. Totally worth it.
BTW, I have four blends I use - protein for long stuff, non-protein for shorter rides, both with and without caffeine.
For 3 days, I get to part of a thousand other journeys.