it’s okay
It does what it’s supposed to, but it often botches the job with finding lyrics for Japanese songs that are actually in Japanese and not transcribed into the latin alphabet. This won’t be a issue for most users, which is also a problem that the iOS version of the app has.
And, it would be better if opened up the lyrics as text in a tabbed window under the app’s button in the menu bar.
ThatGoofyGuy about Instalyrics