CDFreaks has posted their first look at dual layer DVD+R recording, using the upcoming BenQ DW830A DVD writer. Here's a snippet from their preview:

As we could all see the compatibility with various drives is very low, only the two DVD Writers able to write dual layer media were able read the disc, and only one other drive were able to read it. Yes we know that you are wondering about Set Top DVD-player compatibility. Unfortunately we did only have one player available to test with and that is a Denver DVD-188DIVX, cheap but pretty new and officially supports both DVD-R/RW and DVD+R/RW media. The result? Unable to detect the disc, after insertion it just claimed “No disc”.

The dual layer DVD+R writing format doesn’t seem to be a good option yet as the compatibility of the written discs is not very good. But this entire article is based on a pre-release drive along with pre-release media and we think and hope that things will improve in the future. Hopefully most manufacturers will be able to implement booktype changing for dual layer media, hopefully making them more compatible with various devices, especially Set Top players.