The Silicone plug is a waste of time, don't bother trying.I like the Limitless+. Nice rdta. I have no problem with the rdta roll to keep the wicks nicely moist. My only issue is no matter how well you wick it, it will leak if left on its side or rattling around in a pocket. But for around the house it's very enjoyable. Big chamber so big coils are the way to go. I never bothered trying the plug for single coil. It's really meant to be a dual coil build.