I don't know why the manufacturer wouldn't do that in the first place. Required for SCT users. Thank you to OPT for accurate delivery.
Have yet to use them although I feel certain that they will be an improvement due to the greater ease of adjusting an out of collimation lens. For me, a total novice, I will ask one of the experienced members of the Temecula Valley Astronomers, like Clark Williams, for guidance since collimating a telescope is not a trivial matter.