Today is five months ZC for me. I had a couple of slip ups during that time but have been going strong for the last couple of months. It is getting to be second nature now. My energy levels are finally feeling normal and I don't really have a problem with leg cramps anymore unless I am actively losing fat.
My weight is still up a little from my low last week but that bounce tends to happen when I hit a new low, so I am not worried.
Overall, I am surprised that I have been able to go this long and even more surprising is that I can see this as being sustainable for the rest of my life. Part of me, in fact, is pissed that I didn't know about it earlier and I wasted so many years with poorer than necessary health and fighting my weight and acne.