I bought a bottle and tried it out yesterday.. Very nice results! I think it worked best on the fanged grill and mirrors, extremely well on the cladding, and so-so on my so-far-gone hood insert - let's just say it did what it could do. Anyway, the proof will be in how long it lasts. The 1L bottle should be good for at least a dozen applications, which will be the life of my VX if it lasts even 6 months per application.
I was baffled by the picto-instructions, so I googled and found the online instructions posted above. Yes, you definitely have to "wipe off the excess" after application. The instructions said to leave it on 5-10 minute. I found that 5 minutes wasn't quite enough, so I left it on for 8 min. I set a kitchen timer for 8 minutes, started it, began applying it to panels until the timer went off, then went back and started the wiping process. Took about 4-5 of these 8 min "sessions" to get 'er done. The only thing I didn't do were my roof rails - I just forgot about them.
My wife was stunned by the results when she came home. The difference in darkness isn't huge, but the effect is remarkable. It just makes the plastic look like new.
Follow-up... Make sure you use a non-fiber-shedding towel when wiping off the excess. I used one that was still shedding a little, and some of those fibers got caught up in the finish.