I have been in prison it was a few years ago so can't comment on the current situation but actually I found it relatively easy.
I come from a very stable background, no MH issues owned my own business and house (mortgage free) never been in trouble with police, I was very scared about the kind of people I would come across but on the whole it's like a small community. Most people look out for each other, sharing canteen, phone credit, stamps (all very important inside)
We were out of our cells for a good 14 hours each day. If we worked on the wing most of the days were spent playing pool, watching movies, listening to music or often sunbathing outside. We had good access to the library, could wear our own clothes, have items sent in by family. I had a tv, DVD player, radio in my cell.
When I moved to open prison it was unbelievable, a huge Mannor house in the countryside, no locks on any of the doors, huge amount of outdoor space, indoor sports hall, pool tables, wii games, karaoke, gym classes, arts and crafts, even a farm. It was very relaxed and nothing like you would expect of a prison.
I did see a few things in closed prison which will haunt me forever, but on the whole it really wasn't bad at all.