I bought two sets of the titanium ones, which have better isolation performance than aluminium. The original set was from the kickstarter then a new set a year or two ago. They're absolutely fantastic at music gigs, you can hear everything clearly without it being deafening or damaging. The only sounds that get in are bone conducted.

I find them comfortable enough to wear for a few hours (3-5) without stress, and I rarely ever wear anything else in-ear like earphones because I don't find in-ears comfortable.

They are so deafening that it took a little while to get used to them, it's weird hearing things so muted but also undistorted