Is it because you block every time I use you. EVERY SINGLE TIME.
Is it because even after spending 20 minutes unblocking you, then vacuuming after, you block again and spew everything out all over the floor the moment I switch you off, and I then have to do the unblocking rigmarole all over again.
Is it because you block not in one place but in three places, which can take multiple implements and 20 minutes to unblock.
Is it because the brushes are so harsh they have considerably hastened the need to replace the hall and stairs carpet.
Do not do what I did last year on a mumsnet recommendation and get one in the sales, I nearly launched ours out my bedroom window this afternoon.