I have had three of this pen over the years, two stubs (I broke one of them) and a broad.
One of them were the black model, and my current two are of the fully transparent version that I prefer.
After my Lamy 2000 this is without a doubt the pen I use the most. It holds a ton of ink, relative to its size. Has a lot of different colors and nib options. And it is very inexpensive.
It writes very well. If I were to re-order them I’d probably go for stub and a fine.
The stub is smooth and awesome. And the broad is also very good, for what it is.
The one thing I have to note about it is that the feed sometimes struggles with keeping up. This is usually not during writing though, but more when I am scribbling out a lot of stuff.
It is one of very few stationery products I recommend without any buts.