After living with my X2, a few "Spring" months, a few more observations… (Again, I tend to focus more on off-road than touring)
At moderate temps, low 70s I think the helmet can already use more venting especially with the visor down and "working" it in off-road sections. I'm wondering how its going to feel when temps are in the 80s and 90s around here. I think the venting at this temp is okay at highway speeds, but when you start working it and need to have the visor down it gets a little warm. The XD-4 did a good job at venting at low speeds…
I also don't feel the air moving through the helmet like the XD-4.
I also found that riding in a group towards the back in dusty conditions (getting dusted) really makes the visor action very gritty, notchy and very hard to fully close or open from fully closed. While this also happened to the XD-4, the tighter tolerances of the X2 make it happen much sooner.
I now feel the the XD-4 is better if off-road is where you like to spend your time. And if you spend your time at speed, then the X2 is probably better.
For me, If I could, I'd swap my X2 for an XD-4… (just my .02)….