I agree with all above assessments!
I have Photosync on my X, and HO on my other car.
The Photosync as someone has said touts that they have the best heat rejection. It's a very bold claim. Their numbers are much higher than competitors.
I would lump 3M, HO, Llumar/Suntek, and other ceramic-based tints in the next category. These tints are more similar in IR and overall heat rejection for degree of darkness (light transmission). 3M has a 40, then drops to 20 (no 30), whereas the others have 30, 35, 40... But even at 40, 3M crystalline still has superior heat rejection compared to the 30-35 of the other brands.
All this being said, I don't believe the Photosync is worth the extra money. As Gambit said above, I cant feel much/any difference between photosync and HO. And since there don't seem to be any 3rd party testing of Photosync, I'm a bit skeptical as to whether it's as good as they claim. I mean, just like Gambit, I'm not dissatisfied with it - I just don't think the value is there when it can be easily twice as much as the other options. So for me, I'm getting 3M on my 3.
I think people used to talk about 3M crystalline as having a purple hue to it, but I saw a 3 in person the other day (also with 40 all around), and didn't notice any purple at all.