I used one for a long time and I found it useful. It was much easier to switch onto working (for me) around other people that are working and they had an obligation to do stuff like keep the internet fast. It was also much easier to have meetings there as they had proper meetings which is great when you need to meet clients.
I kind of feel that the mid option is the library which a lot of people forget about. I almost think libraries missed out on a great opportunity to brand themselves as co-working spaces as they could easily have a section with all of those facilities and magazines/books suited to a corporate space.