I bought three new ones from DiMarzio, but I decided to use only two.
In the bridge, I used the DP100 Super Distortion...
So, this one, new and unopened, is for sale.
I saw a forum comment that perfectly matches my view on this pickup:
"Re: DiMarzio SDS-1 - yea or nay?
I used an SDS-1 in the neck and bridge of my number one Strat for many years. I loved them, back then.
As mentioned, the tone is P-90-ish. They can be noisy, though, especially under high gain. I got used to using my volume control to offset the hum."