How good is RX100 video quality?

you can use any ND filter you want with any of the filter adapters out there, I use the Lensmate adapter with a ND-Digi Pro fader from Lightcraft Workshop

works perfectly...shoot at 60P and get easy 2.5x slomo - here's two videos I shot on my RX100 one that uses 60-24P in parts of it

http://vimeo.com/kazkang/videos

http://cheesycam.com/pc-pistol-grips-now-available/

I use this with a quick release plate to get the camera height a little higher...once you do that it works like peaches and cream - here's a picture of it with my NEX7 on it, the RX fits same way

I would say the Sony sensors on the RX100 and Nex cameras are similar in terms of moire and aliasing with the Canon sensors. Remember the line skipping on the Canon sensors causes moire...so it's a toss up. Basically you get great stabilized footage. You've read the EOSHD.com review of the RX100? just google it, pretty accurate review of video performance (they love so do I)

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http://www.500px.com/kazkang