I did xpel ultimatte, the full front and also the rocker panel and luggage area on my obsidian black. I love it.
I did ask the installer about doing the full car. I was particularly worried about car park dings. Too common here in LA. His take was that if done strongly enough to damage the paint it will probably also go through the Xpel. Not sure if that's true, but when a professional recommends you not to spend more money. Well, so uncommon that you kind of have to take their word for it. LOL.