Got mine nice and quick from USA to UK. Easy to instal per instructions/video - when Dave instals on video he seems quite relaxed regarding how tight so I think its got a bit of tolerance built in. On first ride with it today I noticed bike sounded better but also engine note didn't change intermittently. Before, I felt engine note changed when stock CCT wasn't working effectively (frothy oil as Dave suggests) but with DJH always sounded the same.
That said, compared to my 2006 FE 450, these things rattle!!!