I've used it. (The concentrated liquid, not the $100.00 Extreme wax.)
Most notable thing for me was/is how easily it spreads. One dab can do a full fender. 3-4 for the hood. With that in mind, you can get lots of waxing done with the tiny bottle they sell. (They list in pints or fractions thereof. the small one -1/4 pint?- is around $15.00 for only 4 oz. :eek )
This is a good wax for a person to see how "thin" a thin coat can be.
Also, I could wax a whole car in less than 10 min. (Again-all prep is done prior to waxing). Very slick applying. Not so much after removal.
Water beading was good, but the beads sort of "stuck" to the paint as you drove, rather than running off in a tidal wave as you might see with a wax like Meg's #16.
Definitely use in shade, not in the sun.
I found it to be reflective and "bright" rather than a deep pool.
No cleaners. You have to really be sure your paint is ready for wax, because this stuff won't correct marring.
Lasted about 4-5 weeks for me (on black cars-Breeze and Escort).
I've read that this was one of "the" waxes a couple decades ago. (didn't have access to the 'net then to be with the "in" crowd.

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I used it last year to refresh my memory for a review I did on it. Otherwise I haven't used it much for the last few years. (Not because it's bad, but because I've got soooooo many other waxes to try

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