I've got Mayday experience!
The antenatal classes were fine (though it seems a complete lottery depending on which midwife you get, but I think that's the case everywhere). The birth centre is lovely, but be warned that you may not get in if you have anything even slightly out of the ordinary, or if it's full, or if they don't have enough staff on to take you.
The antenatal ward (amusingly named "Hope Ward" - I don't think so) is awful. That's where you'll go if you have to be induced and it's hideous. Understaffed the night I was there, and horribly unsupportive midwives during the day.
The delivery suite isn't too bad, all the rooms are en suite and there are a couple of pools (again, a lottery depending on whether you get one).
The postnatal ward is horrible. Staff who don't care, and everything is incredibly slow (like discharging you, or getting test results back).
It's worth going on the "tour" of Mayday to see what you think, especially if you can compare it to others. And I had complications and nasty tearing and the perineal team at Mayday are the best in the UK (officially) so should that happen (which I hope it doesn't to you), you are in very safe hands on that front.
Good luck x