I really don't think you can go by other people's opinions with this one. I used to own/ride/train hunter/ jumpers in my younger years..would I do it now? If I had the physical ability to do so, yes I would, even at 50, if I had stayed active in the horse world, (riding, training, etc.) If you have been out of it for any length of time (which I don't know if you have) then you are going to have those issues to deal with also. You know your own physical ability and shape. Are you up to it, physically and mentally, if you are the one to train him? This is a young un'. Tennesse walkers...beautiful horse, temperament, easy riding, but what do you want it for...to compete down the road, pleasure, a trail horse or just to have. If I am looking for a pleasure horse I am going to get one already trained, older and "bomb"proof. Not an old plug, but something I can enjoy and not have to worry about it spooking at every little thing it passes.
I also think you need to see her and the parents, learn their personalities, maybe track down some other owners of offspring from them Observe her in the pasture, in stall, how she interacts with human, horse, and nature in general. Try also after the initial meeting to arrange it somehow where you can even kind of unexpectedly drop in and observe.
She is a beauty...........great Christmas present!