I have one (monoflap jumping saddle) that I got in…2007? and still love it. It probably helped that I had a good idea of what I did and didn’t want, and I communicated all that to Matty.
Recently Patty Merli was able to tweak it to fit my younger mare (had it made for my older one, who has changed drastically as she’s aged). It’s very secure, without being restrictive. I can drop my stirrups and do flatwork, or hike them up and go for a gallop (or a 4-hour foxhunt) and be very comfortable and balanced. I have ridden in other XC saddles and really couldn’t do flatwork in them–those would have been great for actually doing XC, but not so much for the combination of flatwork/hacking/jumping/fitness work that I do on a daily basis. I do prefer to ride in my jump saddle a majority of the time, rather than a dressage saddle. YMMV. I grew up riding in a pancake Courbette close contact, and my other jump saddles are an ancient Barnsby and a Prestige Michel R. I’d say the Heritage gives me a longer seat and balance point than the Prestige (so I can get in the “back seat” when needed) but allows for a similar balance in 2 point/galloping.
The main negative I see is resale value (just due to lack of name recognition). For me, that consideration was outweighed by initial purchase price, but you’re likely to take a big hit if/when you need to resell. If you tend to gravitate toward the same type of horse, I think they will allow for pretty good flocking adjustments, which would make it a safer bet. I had Matty make mine a bit extra wide to allow me to use a fleece half pad, and that extra width has come in handy to pad/shim for changing horses.
