Yep. Vanguard was amazing. Easily the best series out there. And I'm glad they gave it a decent ending. So many serieses just languish and fizzle or end with unresolved plot points (DS9 relaunch, New Frontier).
Read it, you'll like it.
It's not just a good star trek series. Its great sci-fi that just happens to be set in the Star Trek universe.
Book 3 was my favorite. I've forgotten the title but I think its the one that is really hard to find in print. (So you may have to get the ebook or something if you can't find it.)