Got my own WOW this week after having a demo saddle for 6!!! There is quite a lead time on them but it is worth it.
I LOVE my saddle - I have a deep seat model with moveable block dressage flaps and I also managed to get some vsd flaps 2nd hand for faster work/jumping (my mare doesn't like her shoulder hampered by anything too forward and the vsd flap in the forard position is fab).
What I would say is get a good fitter, all the reported 'problems' I have heard about (eg bounce due to the flair) has apparently been down to the saddle not being adjusted properly or 2nd hand saddles that have been used on a horse it wasn't designed for - there are literally hundreds of different combinations so you'd be extremely lucky to get a 2nd hand one that suited you and your horse exactly! (Although obviously you could get a WOW fitter out to adjust/change the components).
What I have found is it puts you in a great ear, hip, heel alignment as there is two choices of stirrup leather position and one is set back (other slightly forward for fast work/jumping if you prefer). It is secure and very comfy - but again it depends on finding the right seat for you (they now do a 'lady's seat too apparently) - my friend had one fitted to her ex racehorse at the same time and she has a flat seat - she hated the deep one that I loved.
The saddles look quite up off the horse/high when you first see them but they really don't feel up off the horse - the memory foam moulds and it actually feels quite close contact!! (Similar to the Suberpanel Fhoenix I think - from what I remember of my trial of one of those - I loved it by the way but my horse didn't!!!)
One other thing my instructor noticed and the fitter did say was that if you aren't used to to riding bareback/treeless the front flexion/movement of the saddle that allows the horse to move can feel very odd compared to a traditionally treed saddle which gives a much more rigid feel - my instructor felt 'wobbly' initially but after a couple of rides loves it and agrees my mare goes much better in it. Its also the ONLY saddle that doesn't make my back sore (I have a long standing injury that cuases me continual low grade pain and bouts of sciatica/spasm) or make my left foot numb due to the strain on my back!
So yes they do take some adjustment too (as does the Fhoenix I understand) but if it suits you and your horse they are IMHO brilliant saddles.
Anyway...can you tell I like it?? LOL!!!
I used Stephanie Gaunt
www.sgequestrian.moonfruit.com - if your visiting Blenheim she will be on the FirstThoughtEquine Stand.

She spent ages putting together saddles that would suit and took her time examining the horse etc - much more than any other fitter I have come across - when our own saddles were delivered she went through all the checks again and made any adjustments to the saddle or the flair as needed - watched us ride in all gaites and generally spent a lot of time with us - this was all included in the cost of the saddle - not sure what other fitters do. I highly recommend her and the saddles - but a good fitter is essential - if Steph isn't in your area she will probably be able to recommend someone.
Phew will stop wittering on now - sorry this is so long!!