Has anyone used both the Synchro-Compur MX and its successor design, the MXV? I'm wondering if the MXV was a real improvement over the MX. I have a Super Isolette with MXV and I don't like the LVS interlock system it comes with. The LVS system links the aperture dial to the shutter speed dial to maintain constant exposure values. To unlink them you hold a button down at the front of the lens. I find it annoying to have to press the button to set aperture and shutter speed independently. Just wondering if an MX version is easier to use or whether it's not worth using because the MXV is a better shutter altogether. To make the comparison more equal, I'm not concerned about the self-timer that the MXV has and the MX doesn't. Any thoughts are appreciated.