I used to be an avid AM collector, but having booked once to Vegas for 2 costing somewhere upwards of $500 plus 6000 points....it doesn't sound that good of a deal anymore.
The problem with that program is that you have to use their travel agency which charges booking fees, but once the tickets are booked, they cannot be changed (which is ridiciulous). Even with the cheapest Tango fares allow you to make changes nowadays.
I have stopped actively collecting AM now.