So, I got BITNB, and since I was the one starting this thread asking for reviews.. I thought it would be good to leave one, too =)
From a strength perspective: it's not amazing, it will definitely not replace any conditioning sessions in the gym, and tbh the legs/butt sections feel rushed and a bit useless. Ab section on the other hand is nice, and I find it much better and ore useful and functional than the crunch-fest that was abs on RLNA. Keep in mind, strength is not the main objective of the video, so it makes sense it's not amazing, and the good thing is that even the leg/ab exercises are back flexibility oriented.
Everything else: REALLY GOOD. The flexibility exercises are sound, good, well paced and pretty well explained, I like the sequence they are in, and how you are always led through opening your shoulders before starting the actual back bending, and encouraged to not only bend from your lower back. A lot of active flexibility, and of simple exercises to open up backs that are tight from sitting in an office all day. Bridge section is also VERY good imho, giving good pointers on how to improve.
Music is cool like always, and I now have a total crush on Stacey, too... so, as everyone else said: if you liked RLNA, this is at least as good as that, of not better.
Caveat: it is VERY back specific (as if the name was not enough), so don't think you can use this as your sole training program, cause it won't do much for strength or lower-body flexibility.
PS: is it me, or Cleo's arms and shoulders (and her whole body, tbh) are INCREDIBLE in this video? I always had a major crush on her, but she looks so *fit* and *healthy* in this one... *swoons*. Sorry :D