It has huge advantages...I wouldn't have dreamed of using a Sakuru on the clay...I would probably have been heavy handed and stuck the pen into it by mistake, but with the brush it just glides over.
I did some red roses (water colour) stamped images...and tried the red over the already painted red...and also the clear.....the clear was better....I think it's the clear pen you probably want to double up on.....when I got mine I did every image on my cards! x