I just got one a few days ago .... but it's still in the box.
I picked the 42X10 over the 42C10 because of the anti-reflection filter. I combed through many forums to find out if there was really a difference between the two. Some said they both share the same panel. Some didn't agree.
Several posts I read convinced me there was a difference. The local seller also told me about the anti-reflective filter.
The 42X10 cost just P2,000 more than the 42C10. Seemed like a small price to pay for the added HDMI port, SD card reader and reduced reflectivity (most important).
I'm very happy with a Panny plasma that I bought earlier this year. I know I'll be happy with the 42X10 too, going by the glowing customer reviews on the internet forums