The ear impressions are really comfortable The ear impressions are really comfortable and I can wear them for a long time. They really enhance the sound by blocking noise. I would like to have received more detailed instructions to insert the custom buds into my ears. I had to use trial and error to figure out the optimal way to insert them.

Good but not revolutionary I like that they are attached to their own pieces, however i had to use the original earpieces over these and fit them inside to make them actually seal. I have the comply ones and the foam in these don't rebound as fast (good thing, the fast rebound tends to hurt the ear). However, if you remove this from your ear and put it back, the foam is a little slow moving so it wont seal and may not even sense the headphone is in your ear. So you are left leaving it in your ear. The perfect fit was this, i had to remove the foam from the attachment (snaps off), and physically remove the rubber inner ring, and then take the original apple earpiece, and put this foam inside that. This is the only comfy way to get a good seal every time.

Custom tips for Z1R Fantastic experience doing business with ADV. I ordered a set of custom tips for Sony IER-Z1R. ADV delivered a perfectly fitting set of tips in far less time than originally estimated, and was also able to deliver 3D scan files of my ear impressions for further use.

Great product with exceptional sound… Great product with exceptional sound quality. I plan on purchasing from ADV. in the future.

Just wow!! Just wow!!! As a musician this type of comfort is a new level, been playing drums and using finally my AirPods and oh man!!! They feel secure, sound cancellation has become high end better than your regular ear tips. They never fall off due to sweat or shaking your head. 100 out 10 highly recommended.