I have only had these on for about three days know and I can't be happier.
The strings sound, contrary to what some people told me on the internet, lively and clear. Besides the sound being great, the feel is great as well! They are not slippery nor sticky but they allow for very easy slides and bending.
One argument against buying these strings may be their price. However, if they truly last three to four times longer than their counterparts they will pay for themselves in the long run. Since I have only had them on for three days and thus can't comment on their longevity I can't tell you if this true. However, even if they last two times as long, it would still pay off.