My thoughts on thecheap stuff are this.
My skills as yet are not up up to a standard to justify spending over $100.00 per sheet on 'A' grade gaboon or hoop marine ply simply to turn it into a heap of sawdust.

As they improve however, and as I work towards aquiring those skills, so is the quality (and price) of my ply increasing. I hope to be to a standard fairly soon where I will be able to confidently take to a sheet of the good stuff and turn it into a thing of beauty but till then, I will persevere with the cheap stuff.
The only ply I have found with voids so far, has been the stuff labeled "okuome" at the local Bunnings hardware store. It was hideously expensive and compared to my cheap $13.00 per sheet blonde ply, the 'okuome' is utter rubbish. I bought a small piece for the decks of my pirogue and there is as much resin filling the voids in it as there is in covering it.
I am somewhat cynical whether this rubbish is the same okuome that you guys are talking about.