I purchased the newer version HVL-20M. For what it is -- works fine. Very light and small-- decent fill bounce in a small room. Can regulate intensity of flash in camera but few options on the flash. Not even an off and on switch Cannot tilt for portrait mode.
This is a bit of problem area with Sony at the moment, Guy.
I would strongly suggest that get one of the tiny HVL-F20AM (new one with the correct foot). This is quite useful despite its size and lack of juice.
I do not know about the others since Sony changed the flash mount with the NEX-6 and the A99.