It seems like recently on Meguiars site that their pro stuff is only reccomended with a rotary buffer, but I know for sure others are using them with a random orbit, why are they saying this now?
You can use DACP #83 and SPF #82 by hand, PC or rotary. Meguiars recommends a rotary for any of their pro products that are more aggressive than DACP. You can use Diamond Cut by hand, but it is a lot of work and you must follow with a less aggressive product to remove the light marring.