My Roon stats are - albums imported = 11,362, albums identified by Roon = 9,124, a "failure to identify rate" of 20%. These albums were imported from direct dBpoweramp rips rather than albums exported from Sooloos. I have a large classical component to my collection.

Streaming: Roon, NUC, QNAP869 NAS
2ch system: dCS Vivaldi, Audionet Stern, Audionet Heisenberg, Magico Q1
Retro system: 101/104/105, Red Rose Spirit