I LOVE the hardtop overlay option. If my Taxi wasn't so borderline, I'd be doing it, but it's one of the few that I've seen that don't have the yellowing on the non-Mylar areas, and my only real wear is around the bumpers so I'd hate to sand down an original PF when it's really not THAT bad to begin with.
That being said, i agree with the others. If you are going to strip down topside to do a full PF decal, why not do the hardtop for an extra $100 or so over a decal? Either way it's going to be the same amount of prep, so you might as well go with the better looking and performing option.