Got great speeds in Germany and Netherlands the past few weeks. Then hit Belgium and back to 2G -- hard to use! Put my Project Fi SIM in and things were better.
I originally signed up for Project Fi because of the better international data speeds, but both TMO deals hit at the right time and I haven't used my Fi SIM much. I would probably drop it if TMO keeps up with the international LTE but I guess that is not in the cards...