I know there have been several threads on one but I think it is worth taking another look. I must admit I would not purchase for the long term until things settled down, but the short term profit has been pretty good! I've been buying this share regularly over the last few months. Usually selling within 2 weeks with a 10 - 20% profit. The price always drops again and I start all over again.
The company itself is quite solid. It's biggest problem is cash-flow (caused by overproduction, and not enough sales so are carrying a lot of stock). They have managed to refinance the short-term lending, and have been reducing this, which if they can keep reducing it, it could stop being a problem.
Of course the uncertainty's over the plans of the Russian Investor Usmanov (which is still just speculation as he has not actually done anything about increasing his stake yet) and other press which also has been just speculation and not FACT has not helped the price continue to rise so instead it has YoYo'd and I and I suspect a few others have been making use of the opportunity!