I did indeed watch it, as a matter of fact.
Unfortunately, the Shelly story only takes up about half of the episode (or maybe a little more) and it doesn't provide any new information. It's mostly just a regurgitation of the info that's here in the OP. So if you already are familiar with the story, it will add little new to your understanding of Shelly's disappearance. I was hoping for a development in the case but there wasn't anything.
The Lisa McPherson stuff was new to me though, so if you're not familiar with that story, then it might be worth watching for that alone.
Like I mentioned earlier, if you have a cable or satellite subscription that includes the ID channel, then you can watch the whole episode here:
https://www.investigationdiscovery....ial/full-episodes/scientologys-vanished-queen
We might need to tag a few people in case they're interested. Looks like this is the last list I used:
@Mike @MusterX @Jackie Blue @weich @JosephDredd @chickenluver @LiLoMMA @MoparOrNoCar @Strychnine @Significance Deficit @Revolver @leto1776 @ralphc1 @JaegerIT