I found the Barry M pen to be very easy to use and would certainly recommend it for other beginners, as it resembles a thin nib permanent marker pen, meaning the application feels more like a doodle on the nails than fiddly artwork.The nib applies just the right amount of polish in the perfect thickness, and has excellent longevity; well outlasting the nail polishes underneath, so, overall a must have for those in awe of nail art designs.
I will report back when I have spent more 'should-be-revision-time' trying some more designs using the white pen too, and having probably made a wishlist of more nail arty bits!