Mine lasted about 18 months, I used the booster twice during that time, but I won't recommend it as I had a tougher time with streaking and removing those streaks than I had with putting on the coating the first time. Mike Phillips used the actual coating as a booster on his wife's car before the booster existed, and if doing it again, I'd do that instead. Just a bad experience with the booster for me. I bought the PBL detailer too, good product, but too rich for my blood. D114 seems to do equally as well and at a very significant savings.
I bought the gloss coat on an awesome black Friday sale and wanted to try it. I still use the PBL on the glass and wheels. I bought the surface coating, not the dedicated stuff.
I've only ever had to wash it, but I wash probably 46-48 of the 52 weeks in a year. I tried a nanoskin mitt, and OCP 10:1 when I suspected it had failed, but it made no difference at that time, I think it was done.
I don't use the special soaps or detailer on it. Optimum car wash, CG honeydew, CG maxi suds II, M34, megs Last Touch, and experimented with CG V7 for a bit. The V7 bought the smoothness right back to the surface, but the water behavior and dirt resistance was effected a bit by using it, so I stopped.
Even waxed it once with PB Natty Blue for a car show, but that wax was gone in like two weeks. BTW, I don't think the coating out right rejects the wax, but it seems to limit its longevity, which was fine, as it was just for that weekend and it helped raise a bit of money for my church.
I'll still use it up on the wife's car when I get a chance to correct it.