Nothing is without risk in this world. Especially since OPEL is still in R&D stages. Luckily they are proving to be resilient in the face of adversity. Short of something insane/unpredictable happening -- I personally think they have a good technology on their hands. It's selfish of me, but I would LOVE to see the SP drop before March so that I can add a few more shares in my TFSA/RRSP.
To be honset, I actually thing that their greatest hurdle is the Canadian market. American copanies have way more access to capital/investors than up here. That's what really worries me when OPEL is ready to sell.