No experience with the Dibea B18 but the Dibea C17 suffers from long hair wrapping round the power brush roller. I've tried some modification of the power brush that was not successful, maybe have to experiment again.

In the meantime bought a Samsung corded bagless, on the 3rd Samsung in 20 years, I like their simple design and easy to get spares. Also a Xioami robot vac that I can really recommend.

The C17 roller brush can also be removed but every long hair gets wrapped round it and gets dragged into towards the drive belt, it became a real hassle to have to dismantle to power brush shell to remove hair from the drive belt sprocket. In my opinion the design has never been properly tested. Anyway I wouldn't buy another Dibea vacuum.

I bought the Xiaomi robot for RM1000 including shipping, it's the first model - without mop. If you do a bit of preparation before use - clear away cables, etc. on the floor it does a great job, much more thorough than manually vacuuming. You still need another vacuum for the furniture, cobwebs, window cills, stairs and other places. I've read some discussion here about the 2nd gen version with mop as well.