Should you buy into commodities giant Glencore?

How do you fancy owning shares in the biggest company you've never heard of? Glencore is coming to town. It's by no means a household name – it's a commodities' trader with headquarters in the canton of Zug in the heart of Switzerland. Yet shares in Glencore will soon be floated on the UK stock exchange. Indeed, the firm has now become so large that it will be catapulted straight into the ranks of the top 20 companies listed in London. So if you have a pension, or hold a mainstream British tracker fund, the chances are you'll soon own a slice of it anyway. But should you buy any more shares yourself?