VCR is still in pilot trials and may never make any money. RDF does not only have (by far) the most reliable system on the market, they are also making $$$. They are miles ahead of any competitor on the market and their management team is sound. ERG is a basket case with (maybe) a future in some years. No orders, no money - nothing.
Having said that, I agree that most here would have stopped buying RDF some time back. I'm just glad I have my shares already, and I'm not letting go in the foreseeable future.
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