Finished Vanguard's Harbinger and I was very satisfied with it. It felt like it dragged on a bit at times and I can say unfortunately that there are some dry parts, mostly with Pennington, that I just skipped over. Overall it was lovely and I'll be definitely looking into the rest of the series.
I'm currently reading through the first book of My Brother's Keeper, Republic, and I really do love it. It fleshes out Mitchell and really makes Where No Man Has Gone Before quite was.