I was looking for a smaller/lighter alternative to my over-ear ANC options (Sony MDR-1000X, Audio Technica ANC-9) for an upcoming trip. These look great, get reasonable reviews, so I thought I would give them a whirl before going down the route of Bose or Sony IEM models.
I have swapped out the Silicone ear tips for Comply T-400 Isolation foam tips, this has provided a much better fit for me, and improved passive isolation. Overall, they are not as effective as my other ANC headphones, but they do reduce the bus/train/office noise, and I will be trying on the plane soon. I prefer the Comply foam tips, but YMMV with the stock silicone.