SOUND: Initialy they are very bright with similiar ''zing'' from roundwounds but not over the top, you can still hear focused mids and warm huge bass foundemental in the core, they are not thumping like someone would think when people talk about flats. They are definenitely ultimate rock flats and they are great combination with the pick, you can easily hear that agression and strong midrange. with tone rolled off you can hear plenty of warmth and bass. E string is BRUTAL sounding with plenty of definition and kick in it. It's little bit dry and watch out they are very low output strings, Steve Harris is using them with high sensitive pickups.
FEEL: They are not sticky like some flats, E and A string have little space between the outer wrap so they are rougher if we can acctualy say rougher for flats, you can't really feel it under the fingers, sliding is beautifull and effortless.
TENSION/FLEXIBILITY: I was expecting much higher tension because people always bashing them for the tension, for me this gauge is ok, with proper setup you can set very low action and play it with little effort, it gives you great feedback and dynamic response and it's great for pick.