I've seen budget roombas for about £150 that i want to use on my ground floor. It only has the kitchen and hallway (there's too much lego in the rest of the house to use it upstairs!) But my kitchen does get very crumby/lots of random dust.
I also have the worst textured tiles ever that trap every piece of dirt.
Would a roomba help with this? I know I would need to hoover still generally