Experience round some of my friends in their catchment area was their reps will attempt endless rounds of doorstop selling, on top of that they will then bombard you with marketing letters (which are carefully addressed "To the occupier" so as to avoid being caught by anti-junk legislation). I've seen the junk, and I've been round people's houses when the greasy sales reps have knocked on the door touting their wares.
If you call them or write to them to ask them to stop, they ignore it and continue.
That alone would put me off Community Fibre for life. I have a policy of not dealing with spammers.
I would also encourage people to read the small print.