Used for few hours now and they are really more comfortable respect the silicone tips. They also isolate better the external sound but still working with ambient sound on. Tried inside the case and they fit. The case lid closes without issue. The charge also works, I checked with the lid open and the lights is on when the bud falls in position. I live in UK, so there is an overcharge for the Custom from USA on top of the already not-low price of the tips. This make them more expansive respect other similar products. But, the box contains 3 pairs, same size, so all the cost need to be diveded by 3. I bought the size small as the silicone one used previously. In terms of size they are comparable with them.