I used my last BOGO weekend certificate a couple of days ago in Athens; it was due to expire at the end of June and my membership expires at the end of May.
I mentioned up-thread that I am not inclined to renew under the new deal. If I remember correctly, a couple of years ago I renewed for ~38,000 points and received the BOGO, a voucher for 15,000 points, and 10% points refund per booking. Last year, I got the BOGO, a 10,000 point voucher, but no discounts.
This year, it's 40,000 points to renew and no voucher or discount. Given that the BOGO has to be used against the full price of a room, I can't see the value anymore. If I save my 40,000 points, I can use them to book a room at many ICs (or points + pay) and can stay any day of the week, not just on a weekend. And using a senior rate, the cost of a room is often not much more than the "50% discount" using the BOGO (and I can use my 40k points elsewhere).
I'm not interested in the cash option and there are not enough ICs where I like to travel to make it worthwhile. After a number of years as an Ambassador, it's time for me to move on.