I've never used any NIK software before, but just viewed an introduction to all the plugins - this is very powerful software! At first I thought it would be too difficult to learn, but the user interface looks to be very straight forward. One huge feature I've found is the extensive amount of tutorial videos. This alone makes it well worth the price for me - 211 detailed tutorial videos - wow!
Webinars
Edit to add - here is the introduction video - 1 hour long.....but touches on each of the plugins.