well with the sensation it was possible to return everything back to stock, Including the bootloader and S-ON..
There was no way it could be diagnosed as being tampered with, If you did it properly..
But with HTCDev. youve already submitted a code (which i assume contains serial number) so all they have to do is check whether that device matches anything on their database of tampered devices. Thats why i dislike it so much..
But i need root for most of my apps so there was no workaround for me...