There are some DMPs on this forum. Just do a search. I've decided not to go for DMP. Not worth it in my opinion.

I've just competed my 12th long haul F segments this year. But will put rest of my miles towards AA where I get double miles.

My wife doesn't need a DM card as she seldom travels by herself and if she does I'll put her in J or F anyway, so not much of a difference.

Apart from that spouse card, don't see much of a difference.

I've seen 4 different DMPs on various flights this year.