I actually preferred it without the personal filter but it's very cool to have the option.Got a pair of these a couple weeks back. I use them with my Sony NW-ZX300 with Apt-x HD. Sounds wonderful. I truly believe Mimi will be a gamechanger in this industry. I really hope that technology takes off. I'd love to be able to install a Mimi Audio Unit on my laptop and use it with Audirvana.
I am, however, totally sold on aptX HD.