Yes, I agree:
Here is a statement Meridian made regarding these DualDiscs. I believe Sony made similar warnings for some of their machines:
Meridian Issue Statement On DualDisc Compatibility
Meridian has issued a statement on the compatibility of the new DualDisc format and their own players. It is as follows:
Meridian has been fully aware of DualDisc since its inception, having carried out extensive tests on the new music carrier from the test-market stage onwards. Meridian endorses DualDisc, which offers wide compatibility across the vast majority of our players. This statement is being issued to give guidance to Meridian owners who wish to play the discs on their systems.
DualDisc is a two-sided music disc that aims to provide the maximum flexibility to those wishing to access or collect high-quality music on DVD. DualDisc has one or more DVD layers on one side, and a CD-compatible layer on the other.
On the DVD side, the majority of discs carry DVD-Audio content, which uses Meridian Lossless Packing (MLP) to provide state-of-the-art high-quality sound. The DVD side also carries a DVD-Video zone with the music in either stereo PCM and/or lossy-compressed stereo/surround formats. All DualDiscs must have, at minimum, a DVD-Video zone with high-quality music and some video content. Most titles include significant added-value material such as movie-clips, liner notes, interviews, concert footage, and other content. For more details, visit: http://www.dualdisc.com/
The DVD side of a DualDisc is 100% consistent with the DVD specification and will play in all Meridian’s past and present DVD-Video and DVD-Audio players.
The other side of the DualDisc contains a layer that is intended to be compatible with the majority of CD players. This layer is not compliant with the Red Book CD specification because it is thinner than a normal CD (typically 0.9mm rather than 1.1mm). This is primarily to keep the overall disc thickness below 1.5mm so as to minimise potential issues with slot-loading and caddy-based multi-disc players. DualDisc market tests showed that a small percentage of CD players, and especially DVD players, were unable to play the CD-compatible side reliably.
Because the CD side is not compliant with Red Book physical parameters, Meridian does not guarantee that the CD-compatible side will play without audible errors in all players. However, attempting to do so will cause no harm or damage whatsoever to our players.