The birthing units tend to let you out quicker as well! I had Stephen at 9.31pm and they asked me at 1am if I wanted OH to take me home there and then! He made me stay until 10am the next morning though lol!
IF I have to go on the main ward then I'll be asking to leave as soon as I've popped Henry out! I couldn't handle being kept awake by other babys (sounds mean but your own baby crying is distressing enough - especially as a new mum, it's very overwhelming at times) and someone I know who just had her little boy said this woman kept her up all night snoring!
Birthing units are def the way to go - you just have to be prepared to sacrifice certain things! The one in Watford doesn't allow you to have an epidural, if you want one then you have to go upstairs and stay there!