I've found removing the drip tip prior to filling the iTank, much easier to fill with 100ml bottles. Even 50ml bottles are easier with the tip off. Only takes 2 seconds to remove and refit.The tank looks nice but but every slide-to-fill tank I've used has been more hassle than it's worth, always due to the rubber grommet not being good with 100ml bottles. They've all eventually split. I personally prefer a screw-on style top cap.
Haven't a few company's already done this (smok first I think) so nothing new then