Mosaic certainly has been devalued.With the increase in fees for more space seats and everyone now getting free changes to tickets there is little value to Mosaic. That said ,I sometimes use the 70lb baggage limit when travelling internationally and I have found that I also do get the free EMS seats at day of check in. I am 4 for 4 as far as getting the setas for free.In fact I have not had anyone beside me on the EMS upgrades that i have recived recently.