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I should think so. I've tried nominatim/osm data but it took forever to query a large set of coordinates. I was only interested in knowing the nearest city and admin regions 1/2. And this library is really fast... ~20s to lookup 10M coordinates on my MBP. If you'd however like to know the full address, then this is maybe not a good idea.

That's fast. Though yes, our use case involves reverse geo of full street level addresses. Currently we do several 10s to 100s of req/s on nominatim.

The sibling thread asked about using OSM data; it'd be awesome if street level OSM data is workable.

For reverse geocoding only as it does not seem to do geocoding proper. Pelias[1] might be a better alternative once they simplified the install process. I had to "reverse engineer" (aka read and understand) their chef cookbook as a Vagrant was not an option form me. Not that complicated but time consuming when don't know Chef.

[0] - https://github.com/pelias

We are currently using Postgis + geonames (the same DB used by this project) and it works very well. I'm curious to see benchmarks comparing the two.

edit: We are only interested in knowing the nearest big city though