900TVL Cameras? Good? Bad?

Some Asian manufacturers keep sending me news about 900TVL cameras. At first I thought that they were talking about HD-SDI cameras but after digging a little bit and with no clear answer this is what I assume:

The cameras they are talking about possibly use the same sensor as HD-SDI cameras (ICX138) but a different DSP. The video signal from the 900TVL cameras can be visualized by a normal DVR where as the video signal from an HD-SDI camera can only be visualized by an HD-SDI DVR. Therefore, I assume that the HD-SDI camera have a specific video protocol.

Am I correct?

Has anyone tried these cameras before?

Even though a normal DVR would not show the 900TVL camera's full size image, the low price could possibly be very attractive for the analog market. So I wonder if there is an opportunity here. Please share you technical and market knowledge on this.

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