If their technology is as good as they say then the company will survive. If it isn't then they won't.
I don't see how as investors we can answer this question so unless you have specific technical knowledge I think it is a gamble. Obviously, the downside is low compared to how much you would make if VLNC ever went back to its former highs. But those highs were set in a rampant bull market so likely that the opportunity for such prices will no be seen.
Are you holding any? What do you know about the company?