Never have I found it worth it
Amex Plat. its just a scam to get you to pay $450 for the yearly fee. If you can use the other perks on the plat car great. When it comes to using these companion tkts. I have found the price of the 1st ticket is far more expensive through Amex then you can possibly get it anywhere else. In effect you are paying 50% to 100% premium. It never pays.