The travel
This issue can be split in 2 parts with both having different themes and both done very good and I enjoyed the whole thing even though it seems the story doesn't move forward a lot.
Loved how the first half of the issue was treated as a crime investigation about what happened to Eobard and the button, setting the crime scene, analyzing the evidence, checking motives, looking for clues to what to do next, it was all fantastically done; all this of course thru Barry's eyes which also gives us a great insight into his mind and history.
After Flash informs a very wounded Batman about what he found, he secretly knows Eobard traveled to the Flashpoint universe who shouldnt exist and decides to go; but of course you cannot cheat the greatest detective so Batman joins him and together they use the cosmic treadmill on a fantastic journey where they get some glimpses of their stolen time Wally told Barry about.
Art is handled by ongoing Flash artist and although its a different style from last week issue, it is still very good, a nice way to contrast Bruce and Barry points of view and a very good fit for the part of the story where they are travelling on the cosmic treadmill.