Riq'a or ruq'ah style is very common for handwriting Arabic.
Its structure allows very rapid writing. I personally don't like this style. My handwritten Arabic incorporates some features found in this style, however. With letters that have two or three dots, these dots are written as a dash or as a circumflex (like a house's roof). I write two and three dots as dashes and roofy points, for speed.
The letter kaf has a little s-shaped character floating inside it ...
... but the riq'a style actually lets the writer connect this to the main body, again for speed. I write my Kaf's like the Ruq'ah style, too. But, apart from this, my handwriting looks more like the Naskh style, just not as elaborate.