My first impression is that it doesn't follow the back very well. I suspect it might be doing the opposite of bridgein (what is that called?), you know where the middle of the saddle has more contact than the front and rear, so it has too much rocker. You, being there, would better be able to tell if this is so.
It has the older English style of padding for the rear of the tree; it curls upward quite abit, so it comes away from the back quite a bit. On the one hand, some curling away from the back is ok because when rider is in the saddel, it will sink down and the horse's hip and back movement will move into that open space some as you go along. The bad thing is that it reduces significantly the amount of weight bearing surface of the tree. This shape does not work well for any horse with a fairly flat or upwardly rounded back, like a warmblood.
The shoulder looks like that angle is quite good, though certainly no excess room. It sits on your horse at the correct angle , with pommel lower than cantle.
But the channel is very narrow. Does not look like it offers your horse's spine much clearance.
I think I just offered you a mixed bag, but if a bunch of other people say the same thing then you can add up all the pros and cons and decide which way the scale goes.