Outstanding and infinitely more elegant than my hacky solution for alphabetical table grids in Ember (I always try to SEO-up my comments here for the future guy like me trying to figure all this out 
).
Interestingly I just discovered the resizing bug and was afraid what it was going to do to my week. Greatly appreciate you taking the time.
Would I be able to this.store.getAll on the component similar to the push answer here to get the dynamic array working?