I have the XH-A1 and would buy it again. Good price, amazing image, and great interface.
I did some work with the EX1 today and was pretty annoyed at times. Sony is amazing at conceiving ideas, but cuts other corners that make trying to actually USE their equipment quite a headache.
The EX1 has 3 things that the A1 could benefit from:
1) Mechanical zoom, focus, iris
2) High resolution LCD screen
3) Solid state media
Unfortunately Sony still puts too many crucial options in the menu, which is already buggy, even for a first generation model.