I have a 20 qt. Rival I bought about 6 years or so ago. I have never used the regular oven since for my turkey's.
Biggest turkey I ever put in it was 23 lbs. Stuff, place on rack in roaster, season, cover thighs with foil (the turkey's thighs so they don't burn)lol, place lid on, and hours later have a nice browned, moist, juicy turkey.
In the meantime, my oven is free for anything else I need to bake.
Also, I have enough space I can put the roaster out of the way on the floor, in another room, whereever so I free up counter space. However, I would not place outside of the home. Need that smell permiating the home.