The first impression when you unpack once is quite - cheap. The combination of shiny hard plastic in neon yellow and soft black areas I do not really pretty. In addition, this combination material design has unfortunately one or the other weak point. So the (black) handle surface is relatively slippery, thereby is also the slip stop not very effective. This is indeed again a little offset by the "brake pad" for the middle finger, but goes much better. In addition, the thread has game and not operation gave us confidence arousing.
Positive is that both the grip and the spring are neutral stance. Thus, the filler is equally suitable for left or right handed. The M-spring is typical Pelican, quite broad and writes softly and uniformly.
Overall, I think this filler is not particularly successful, for the scheduled price I would expect much more.