Actually, there is not much to say about the Nebelwerfers NW41... It is a must have for any german player.
It is extremely cheap (even for SS companies) option for quite powerful artillery support. Because it is a rocket artillery, it doesn't suffer from range-in penalties. However, your enemy can range-in based on smoke trails, but from my experience it doesn't matter much :)
What you can see below is the content of NW41 blister, plus one additional Kubelwagen as a transport team for the observer.