Exactly, and by supporting a vendor, you are helping to ensure ongoing product innovations (like the subject fuel module) and reproductions for a 38 year old orphan car.
I think if you are seeing failures that you suspect are due to debris, you should perhaps look at their installation procedures. Installing any pump regardless of price point in a clean environment is important. Because the fuel returns to the tank, it is of course important to surgically clean the tank, but remember that dirty components downstream that can return contaminated fuel to your clean tank.
Failures right out of the box are not that rare in today's mass production world. That said, I have had great service after the sale from DMC when I have had any problems with a product ( the same can be said for several other vendors too ).
I am completing 7 years in-service with my DMCH all in one fuel module without a hitch. To me, that's reliable. But, I also went through the entire fuel system during my restoration as well.
Cheers,