Just received my EZ-Leveler -II, ordered before I was told the bubble didn't need to stay in the circle, a great piece of kit. I was surprised to see the "to camera" fitting was a "continental" or 3/8 inch fitting. I can see the logic if it being used with a rotator 'cos they are all sleeved with the same size fitting but it does preclude fitting most cameras directly onto the head; something I am sure most photographers might want or need to do at sometime; a 1/4 inch thread connector would transform the EZ-II head into a viable purchase for "non-panoramic" photographers who just want to level their cameras. Surely it wouldn't be too much hassle to include a 1/4 and a 3/8 inch screw.
I also think a built in spirit level would be useful: I know too many bubbles is like having more than one watch - you never know the correct time- but again, there will be times when it will be used on it's own and a level would be a plus.
Just thoughts and, as I say, a nice piece of kit.