Kudos for releasing the data, even though you are closing the service. You handled it much better than the Echo Nest when they closed theirs. I always thought that using Solr for the index in Echoprint was a bad idea. While I have never tried it, I think you could run the technology significantly more efficiently with a better (custom) fingerprint index.
Thanks :) Hope it will be of use to people.
We don't use solr, we use elasticsearch and we also don't hold the unzipped fingerprints in the same format the default echoprint does. But for this dump we exported everything in the official echoprint format so people can use it with the default cluster.