I've been looking at that stuff for a while now. Did you apply it yourself or have a professional detailer do it? It doesn't look very difficult to apply, but I would want to make sure any paint correction needed is done before it's applied.
I had a professional shop do it, because the wax has to be stripped, scratches need to be buffed out and it works best if it is put on at that point. If you have scratches and apply the opti guard, all you are doing is protecting scratches.
That said, now I can run through a typical touchless carwash at the gas station and my truck looks like it just got a full detail. No more water spots, no more "missed" dirty areas....whole truck just sheds any dust or mud. In fact, I stopped at Office Depot yesterday, and a bird shit on my A- pillar, by the time I drove home, just driving made that come right off, just left a tiny little trail about half an inch, came right off though without water.
Im happy with it. BUT, I cant speak to the issue that it eventually wears off. I do have a 7 year warranty that covers the product, and even if I have to spend 500.00 every seven years, it is cheaper by FAR for me.