Ummm, a couple of things....
Have Mr. Burton or Mr. Leatham personally handled, examined and worked on your specific SA 35? The devil seems to be in the details of these things-particularly over time and roundcount. And I strongly suspect that particularly in the case of Mr. Burton any "endorsement" would be contingent on not just looking at, but replacing and/or modifying components, which probably would come (as it should) at a not insignificant price. If and when that is factored it, it should be compared to the price of a decent used FN/Browning, with minor judicious upgrades (like thoroughly re-springing, for example).
How many rounds have you actually put through it? Anecdotal empirical evidence seems to strongly indicate that things can be going swimmingly until around the 800 roundcount point is reached.
And one further thing: No matter how good these superficially appear (and they do look pretty decent), keep in mind that they're essentially reverse-engineered, without the benefits of the FN blueprints, master schematics, steels, manufacturing/manufacturing techniques and quality control.
I'm not suggesting that a SA35 couldn't be made to work/be reliable/be durable. I'm suggesting, however, that it's unlikely to occur with an out of the box pistol, and that users (as opposed to collectors or shoot-it-once-and-sock-drawer-it owners) might be well advised to have some preemptive work factored into their costing matrix, or choose another route. I would have little issue with getting a new FN High Power, cleaning. lubing, performing some reliability and familiarization firing/qualification, and then comfortably carrying; a SA 35, not so much.
Best, Jon