Thank you for your feedback... I'm concerned about the file quantity the BDP-1 can manage without issues.
FWIW, I have more than 13,000 tracks on an attached USB drive with a BDP-1. I've experimented with USB Flash drives (128 GB and another 512 GB), as well as NAS (WD MyCloud). The attached USB drive is fastest for library generation (it's a powered, 7200 rpm drive).
The internal MPD playback software, and associated apps (e.g. MPad and MPDroid) work without breaking a sweat; library generation from scratch takes only a few minutes; playback is flawless. My guess is that my library could be a LOT larger with the same user experience.
Manic Moose works, as well, once your library and cover art are generated; that can take a seriously long time with a larger collection. I've been downloading the BETAs as they appear and the library issues are improving.