Tried them, and decided i'll stick with olives from now on. The olives are simply so much bettere: way more isolation and much more comfortable than silicone tips. Also, thought the difference in sound isn't really much, i prefer the sound signature that the olives deliver.
Yeah, that's what finally led me to opt for the x3ii over the x1, as my PC soundcard (the realtek soundcard embedded in the MoBo) is utter garbage: lots of hiss and an overly bright and harsh sound.
But i'm also considering buying a topping nx2 to pair up with my nexus 5, more for the sake of having more audio related gadgets than for a real need .