I have a pair of their 60w Hellatones, which I think are actual Celestion Vintage 30s with simulated break in. I'm not sure how much of a difference their break in makes, but they sound great to me.
I haven't used any other Avatar speakers, but tried a few batches of Warehouse Guitar Speakers, and felt pretty "meh" about them. Nothing wrong with them, but where I'm looking for a specific Celestion (or other sound), I've found I'm better off just going with the real deal. I'd go with Avator or Warehouse or whatever when that's the sound you want, not because I think I'd be happy with their cheaper/idealized version of someone else's speaker.