I too just received my new DX. I have had a K2 since they came out. It's a bit hard
to tell how good or bad the device is due to the fact that whispernet is taking forever
to re-download my content to my new device. One book I did buy has problems
on the DX, and that is "Solaris Internals" There is a diagram in it that is no longer
correct, it's now in the e-paper equivalent of inverse video. I'll likely comment more
as the downloads actually happen. I suspect Amazon is overwhelmed with upgraders.