Well, it could be very useful as a more advanced "model" layer in browser-side MVC apps. I'm currently working on something that has a pretty complex data struc

Well, it could be very useful as a more advanced "model" layer in browser-side MVC apps. I'm currently working on something that has a pretty complex data structure and simple JS objects/arrays simply don't cut it. LokiJS certainly seems worth looking into. The feature that looks especially promising is the ability to create Dynamic Views and to listen on notifications on these views.