That's unfortunate for anyone who bought one but it sounds like RDR is doing the honorable thing buy recalling them. I don't own a SDP but I have an NCP and CUBL on the way.
I have a bit of background in design/modeling and I was skeptical about the structural integrity when I saw the first photos of the SDP. My guess is the metal inserts/area around them was the failure point. I'd be curious to know what departmental DT testing was done prior to public release.
@the_theory_police on IG (same guys behind the NCP) have a zero degree cant adapter in the works. It will be made out of 16 gauge stainless. Looks like it will cost <$5 shipped per unit. Another option to add to the growing list.