@george1421 Are you talking more about the client than simply deploying an image? Will 1709, without the client, still deploy just fine with the current stable version of FOG?
In regards to the other stuff: yeah, there are several bugs related to SetupComplete.cmd and cleanup of defaultuser0 in 1709. Some of the issues were (apparently) fixed in the January cumulative updates, but I know of at least one person who continued to have related issues even with the update applied.
SCCM administrators are having the exact same issues, mostly with Task Sequences, which use some of the same mechanisms to work.