Yes it is overpriced and slightly under performing (And I'm a huge menzerna fan), but it still is a very good sealant. If you where thinking about FMJ and want something similar I'd try Zaino too. The old Zaino is like FMJ on steroids and they have even made their product better. At a minimun you should buy 2 z2's, ZFX, and the QD spray. The reason you have to buy 2 of the Z@ is because if you buy one and use it up, you will have too much ZFX left over. One zfx -treats- 2 Z2's, it is the most forgiving sealant I ever used. Too thin, too thick doesn't matter, just wipes off. Unfortunately, this combo will cost you more than FMJ, but will last you a decade, unless you become a Zaino freak and start Zainoing everything.
Another similar water based product like FMJ and Zaino is Wolfgang, it is only 19 bucks for a bottle at autogeek and is similar to FMJ. Another good option is to try klasse AIO, which is a cleaner and protectant, and you can put anything on top of that, nuba or sealant. My favorite combo from Autopia is AIO to p21s wax, I'd personally skip the klasse SG. Going from AIO to p21s will protect you car better than any sealant alone, but wont last as long. Wax over AIO is thicker than a couple coats of most sealants, and thick is good. The wax guru rated these two products 2 and 3, behind Zaino. You can't go wrong with either choice.