[turbo6bar]

I would not use an airless sprayer inside unless the house is stripped of floor coverings. The masking is a lot of work. I think you would find good use on fencing and decks. For exteriors in siding, my limited experience has shown spraying is definitely inferior to a roller and brush. Sprayed paint doesn't adhere as well.

The sprayer is indeed nice for ceilings, but you must be careful of overspray. For walls, the sprayer is no huge advantage. When spraying, I've found it's best with two people. Well, give those two rollers and you can cover walls pretty quickly. The trim and cut-in will eat your time, and not the walls.

I bought a pro level airless sprayer about 5 years ago and use it on my rentals. I use it less as the years go by.

I would use the sprayer for:
ceilings (assuming the house is cleared and has no carpet)
trim (if the house is bare and has no carpet)
primer on floors
painting trimwork before installation (sprayer is über nice here)
doors removed from the hinges and outdoors

I would use a roller and brush for:
walls
exterior paintwork
walls and trim