I've been using Poliglo now for 4 years on a 15 year old 5th wheel. We bought it 5 years old and the fiberglass was already dull and faded. I'm kind of anal about my stuff and just couldn't get the look I wanted using other products. Using buffers and polishers may have worked but waaaaaay to much effort for my tired body. After using Poliglo I am one happy camper and have never regretted it. FOLLOW DIRECTIONS!!! Many that have complained didn't do the necessary prep to insure good adhesion. Also note that you want it as clean as possible cause once it coated, trying to clean spots left behind requires removing of the product and recoating.
I have noticed that the required coat or 2 yearly does indeed bring back the shine.
I also vouch for the original product (Poliglo) vs the cheaper alternatives. Considering the investment, spending a little more for it is money well spent.