I have been using this system for a bit -- though since it is still in BETA and expect gaps, I am able to play around them. The Developer is responsive in answering questions and accepting feedback to improvements, but I think he's a one-man-show, as things do get pushed out there, just not very fast. And I heard that things are delayed, since he just doesn't have time to work on the project from time to time. I haven't really pushed the system to it's limit as most of my sessions are TotM, and only use maps/scenes for "conflict resolutions" but I think it handles the skill rolls pretty nicely.
As for compendiums --yeah, would be nice if things were available, but like I said the project is evolving, and even as I manually put things into my compendia I am facing limitations, which I tell to the developer. It's not quite ready ready, unless you're like me and willing to accept the limitations and inform the developer of them, as you experience them, but it is getting there.
A note on "Mongoose Branding" -- yeah, I don't know what Mongoose is doing - I found several "Origin of Species" titles on DriveThruRPG, and they are ... trying to be nice, lacking in the quality department... severely! I wouldn't be happy at all with those products tainting the brand. Seems like Mongoose is not too concerned about quality, and just looking at quantity of products that have their brand on it?? Gosh, I hope not!