NX7 + ST130, Firehawk & Black Diamond + Marantz 8012 + Def Tech 9080s +more.
We noticed it on the 100l5f using out 4K Samsung Demo video that we used when we shot our "UST Shootout" (to be published soon). It wasn't terrible, but was visible under scrutiny. I believe it is visible in the video we shot but really only on 1-2 specific scenes.I've definitely noticed this. This projector does not introduce banding if you are watching high quality content like a 4k bluray. However, for lower quality content that already has banding in it (low bitrate bluray rips, some lower quality streaming content, etc) this projector has very little post processing for removing existing banding. My previous Sony TV did a much better job of cleaning up poor content than this projector does. This is not a big enough issue that it worries me personally at all. High quality source material looks amazing.
PS. Not "vertical banding" as in dirty screen effect, it does not suffer from that at all.