That saddle looks soooo comfortable! I agree with the folks who said, if it fits you and your horse well, and you can communicate with him properly, who cares how deep it is? I personally like the style you have where there are no set thigh blocks jamming your legs into an uncomfortable position. I tried my trainer's Isabell and felt like I was trapped in a vice. I don't think I could have bailed out of that thing if my horse went off a cliff since I was so jammed in there. Unless the saddle allows you to be comfy and relaxed, there's no way to do correct dressage riding in it.
For "beginners" in dressage it is appropriate to have a deeper seat for exactly the reason you are looking at that saddle - for security.
I do not like to see beginners in those saddles with the huge blocks, and deep seats because they put the rider's seat in a very "aggressive" position. It is very hard to be neutral in those saddles.
I like the looks of this one. If it is not fitting your horse super well the Stubben Maestoso is similar in shape/comfort for the rider.
Well, it does have big knee blocks as well - which are fixed, but I actually really like big blocks (bought the big ones for my Isabell). That said, I also don't really notice the blocks on this one because my leg seems to going in exactly the right spot without any forcing. I'm beginning to think whoever owned it before me was exactly my size and shape.
Good to know about the Stubben. I'm going to get some pics of fit on my horse as well as with me mounted.
I'm not a fan of the Isabells at all. I have short legs, they are made for people with short legs, but upon getting off after riding in one my hips ached. I felt locked in the whole ride, found it extremely difficult to use my seat to the extent that I usually do, and just all round hated it.
If the saddle fits you, your horse and you feel very comfortable in it, by all means go for it. As long as it isn't locking you into a position. If it makes a correct position easier, that's good, if it forces you into a position, bad!