This is hands down the best map for flow that I have played. The mapping matches up perfectly to the "lazy", slightly syncopated rhythm of the song.
The pattern is largely varied, to the point where I still have not memorized any patterns, even after playing this song dozen of times, which, to me, is a good thing, since it means I can keep coming back to this song without getting bored. This song uses diagonal blocks liberally, and to great effect, to add an element of uniqueness that sets it apart from other songs. It also makes you move your arms in opposite directions a lot, as well as having lots of sections that make you alternate hits between the red and blue, playing a different pattern with each arm. This all works to make the flow in this song one of the best around.
Pacing here is good, the song starts off tame, and ramps up the difficulty slowly, but still manages to stay in that sweet spot where it never feels too easy or difficult. There's a section of down-time in between the two choruses to help you refocus, then the difficulty cranks up again just in time for the second chorus.
The difficulty is perfect for an expert song, although it might not pose a challenge to the Jedi masters out there. However, I believe that even if this song isn't hard, it is still very engaging and entertaining to play. I would rank this map's quality as similar to the standard songs, which is very good.
Expert / Hard