So apparently since I have dedicated all of my Voyager novel reading to the relaunch novel series...apparently I missed the fact that there are a ton of other Voyager books?! 
I recently started dating a fellow Trekkie/Trekker and he has about 150 Star Trek books and I have been borrowing them (IT'S LIKE MY VERY OWN STAR TREK LIBRARY!!!). I noticed he has about 10 Voyager books that I have never read and missed somehow! Example: Echoes.
Started reading Echoes and it is pretty good so far. Are these in some sort of series or are they standalone? How are they? Worth reading all 10-15 books?

I recently started dating a fellow Trekkie/Trekker and he has about 150 Star Trek books and I have been borrowing them (IT'S LIKE MY VERY OWN STAR TREK LIBRARY!!!). I noticed he has about 10 Voyager books that I have never read and missed somehow! Example: Echoes.
Started reading Echoes and it is pretty good so far. Are these in some sort of series or are they standalone? How are they? Worth reading all 10-15 books?