This type of technology represents a major leap forward for the in-ear users because it eliminates most problems associated with cables, such as durability and microphonic noise. It is a lovely piece of kit, but it still remains clear that the Kleer technology has some major deficits, especially when it comes to the background hum or noise if you will. With a noticeable "E"-buzz going on, listening fatigue is much higher when using the W1 compared to just running them of my DAP or amp plus DAP combo. The sound quality takes a small hit, but it is barely noticeable unless you are sitting and listening intensely to the music.
The rest of the benefits are pretty obvious. Free from cables you are able to roam around your room without having to take your PMP or DAP with you all the time. Besides that not having a cable to pass through your jacket when going outside makes IEMs much less of a hassle to use on a daily basis. Even though it is not a perfect solution it is still more than good enough to warrant its existence, but do not expect it to be on par sound wise with a cabled solution. The great part about the Sleek-Audio version is that it can be used with all of the earphones Sleek produce.