No matter if Donald's new or not. He's sharing his first hand experience on the G.A.S. DISA kit with all of us. That's the important part here.
We'll see if the remaining portion (vacuum diaphragm) of his original DISA will hold up from this point on.
I replaced my DISA with a brand new unit last year.
I had considered getting the same G.A.S. V.R.K. however, at the time I just didn't wanted to mess with retrofitting anything. Plug & play - less than 10 minutes to get everything re-assembled.