When writing with the pen, I've never been able to find a comfortable position. If you fold both handles down, the pen is pretty thick and has awkward pieces jutting out from the handles that make it difficult to hold in a writing position. If you don't fold the handles down, they flop back and forth against your hand while you write. I think they were designed to be folded down when writing, so that just means you'll have to get used to the abnormal grip they require.
It's hard to recommend this pen to anyone as a writing instrument. It's fairly obvious when using the pen that the number one design requirement did not involve writing. That being said, if you are a fan of Spyderco or the Balisong knife genre, this could be a fantastic gift or novelty item. It's fun to play with, but just not all that great to write with. In a pinch, it definitely writes, but I wouldn't go so far as to call it a writing instrument.