HTC are region specific just like Samsung. There's three main variants.
Asian - 2.5GHZ 801
WWE - International 2.3GHZ
US - Same as WWE.
Then just split up into carrier branded per region. Isn't too hard to fathom.
With S-OFF you can change model ids etc and make it any variant you want and flash any firmware on it. With Samsung you risked a massive screw up.
Sent from my HTC One_M8 using XDA Premium 4 mobile app
another thing i was wondering was that is it possible to flash custom roms on s-on devices because as you can see in the screen shots i posted the device is s-on and the guy has managed to make it a GPE device...plus is it possible to go back to sense and other aosp roms after flashing a google play edition rom? i might just bite the bullet and pick it up tomorrow all the research is getting on my nerve