Pros: ease of use, large selection, you can start right away, wonderful Tarnsporttaschen
Con: Filters are initially introduce very sluggish or off and deport, magenta color cast when using 2 filters together (I think because the Cokin P-originals are not much better)
The gradient filter you can actually save in the digital age (except possibly tobacco and blue), the GND and ND filter suffice for an introduction to landscape photography all.
What else you should say: at focal lengths to 17 mm on the crop (28mm KB) may cause vignetting at the edge if you use the enclosed sun visor.
My clear recommendation!