Roomba i7+

I must get one of these, they look so convenient especially since vacuuming is my most hated chore

Have you used a roomba?

has it learned to stop bumping into furniture yet? I got a Roomba about a year ago and it smashed itself (and my furniture) up in the first week that I had it - it just didn't learn my floor layout at all

I need a robot vacuum that can go up and down the stairs and over large door thresholds... otherwise I need about 7 of these.

Nowadays these robots are way more affordable than ever and that's a worthy purchase. Though I must admit that according to various sources like https://robotsnavigator.com/ the 980 model is more efficient and has a bigger bin but it's also a bit noisier. But performance is most important to me.