I own X5s and have heard PAP speakers twice at two separate NY audio shows.
Very reluctant to do any kind of comparative analysis since time and different listening circumstances are significant variables at play, but I can say the PAP speakers sounded terrific, as do Spatial Audio speakers. Open, clear, vivid and vibrant. They have similarities in design, of course, leading to similar wave propagation patterns while their drivers are very different (with more choices with PAPs, which I do not necessarily consider a good thing), among other differences. I bought the Spatials for a number of reasons, some related to sonic preferences and others related to …. well, the things that inform buying decisions like aesthetics, trust, belief, price, timing …
Both are very much worth checking out before buying.
