ReactiveClass package - hidden gem or old junk?

I was looking to simplify my upcoming app with some OOP. There is this one package I found that nobody uses, but seems like a lifesaver, check it out:

Seems to me like a great Mongo wrapper and also would make it a lot easier to maintain code. What do you think? Is there anything even better out there? What OOP practices do you use?

I am not sure about this package (tell me if I am wrong, but it seems it works with the allow/deny model, which I would not recommend). I think many Meteor developers use meteor-collection-helpers, which provide a basic but useful OO layer.