I have one! I got rid of my last dressage saddle purely because the block didn’t fit my thigh at all, it was just what I had available at the time (for context: I have the same inseam as my brother who is 6’1”. I’m four inches shorter than he is). The K&M has been a lot better for my leg—I had some minor interference when I first started riding in it just because I’d been in my jump saddle (which has a long extra-forward flap) for ages and had to train my leg to be longer again, but once I got my stirrups down to something resembling a proper dressage length the blocks were perfectly fine.
I did get lucky in that I bought it from another boarder at my barn and got to ride in it for a month and have our fitter look at it before purchase, but it’s definitely worked well for me so far. Would recommend if you’re not looking to spend an arm and a leg (lol) to get something compatible with a long femur.