Well, I just got my RS46 back today from having it's 3D firmware update, I sent it in the previous Monday, today is Friday, so an 11 day turn around time including the long weekend(from Texas to Atlanta, GA), not too bad I guess. Course I felt every day without it.
Initial impression... I was alarmed. The scene in Resident Evil 6 Retribution I watched right before sending it in, and watched getting back is what I call the crosstalk acid test.
Both before and after, the shots in this scene exhibit the most stark/distracting example of crosstalk I've come across. Whether the scene improved with the update, I'm not 100% sure, but it may have, slightly.. maybe. I was alarmed enough at that point to check the switcher version in the service menu, and I do indeed have the "fixed" firmware.
Upon watching a few scenes, I noticed myself getting into them more. RE Retribution gave me a headache from all the crosstalk before, here it's almost negligible. Crosstalk appears here and there, but it's not nearly as distracting as before. Likewise I plugged in Drive Angry, I remember that this was my very first 3D Blu Ray and remember how disappointed I was in the amount of crosstalk in the opening car chase lol, here the scene is extremely watchable, crosstalk only rearing it's head for a split second right in the beginning as the truck is coming down the street(and that crosstalk vanishes when paused, which leads me to believe a lot of the crosstalk still visible is actually ghosting due to JVCs notoriously slow panels). Likewise the very opening shot of the car driving out of Hell, Hell is more visible and distinct than ever, terrible crosstalk there before.
Overall I don't notice a brightness difference, my projectors already up to 730 hours btw. The "crosstalk cancelling" adjustments lowers the brightness as it goes down -8, and increases the other way +8. The crosstalk in shots remains just as visible in the lowest and highest settings, so turn it up to +8 to get the brightness out of it. The "parallax" adjustment just moves the crosstalk around, you can correct it in one shot, and it'll be bad in another shot that previously had no crosstalk, so best to leave that setting alone, just as in pre update.
Was it worth it? Absolutely! The improvement isn't as night and day as I had hoped, but movies which were previously almost unwatchable are fine now. It's already more relaxing to look forward to future 3D releases and not have to wonder how bad they will be on my projector. That said, JVC should have to pay the goddamn shipping, as the update brings the projector up to the advertised specifications!