I've recently moved away from the area, so won't be having my baby there, but I had my appointments there up to the 24 weeks.
I've heard good things about the birthing suite there, but can't speak from experience.
My experience of routine check-ups was generally negative - worst thing was the midwife I had disagreeing with me about how many weeks pregnant I was (based on the date of my last period, i.e. a matter of fact/definition not one of opinion). I had to count the weeks for her to convince her that she was using her dating calendar incorrectly. It just made me think that if she can't do such a basic calculation, how can she possibly be competent?
I saw another midwife at the next appointment (having complained and asked to see someone different from then on) who wasn't impressive either. I asked some questions about some stuff that was worrying me, and came away still worried. ("Patient reassured about xxx", she wrote in my notes. Reassured my hat!)
Next couple of appointments I saw original midwife, despite apologetic note from Whittington saying I wouldn't be seen by her again. Both felt pointless - she said "how are you?", I said "fine", she listened to the baby's heartbeat for a 30 seconds. She then wrote in my notes (a) measurements for the height of my fundus, which she hadn't measured (unless she was doing it by eye, or something, which seems unlikely) and (b) that I had felt the baby move - which she hadn't asked me about. I was very unimpressed.
However - I was impressed by the sonographers both at the 20 week scan and the dating scan - they were both happy to answer questions once they'd done their technical bit, and when there was a problem at the 20 week scan I saw a consultant the same day, who was brilliant - everything I'd want in a doctor. I felt that she was being honest, listening to my questions and giving me useful answers, explaining my options, not being patronising, putting things into perspective, being sensible and no-nonsense (which was exactly what I needed) yet also sensitive - I couldn't praise her highly enough.
Overall, I'm not sure what I'd be doing if I hadn't moved away from the area - probably researching UCH tbh, although the Whittington was much more convenient. I was not impressed that I was told I'd not been seen by that midwife again, yet then kept getting appointments with her (if they had told me when to make appointments to avoid her I would have done!) and really wouldn't want to give birth supported by the first midwife I saw - but than it very much seems to be the luck of the draw with midwives and, as I say, the consultant was great, and I have friends who have had excellent experiences of birth at the Whittington.