I brought an Offset Friend 1.5-2 to Joshua Tree and indeed I used it a great deal. I'm not saying that I would have been stuck without it, but it was nice to have. I realize there is a natural tendency to find a place for shiny new gear in the rock. Having said that, there was one place on the second pitch of Mike's Books that might have otherwise been a tad runout where the offset fit beautifully.
There seems to be a few of these offsets still available on the market if anyone is interested.