Silverblade, I was feeling guilty about having a rant and going off-topic, but now I feel better after reading your posts. Apologies for getting you started! It's all about risk, and potential for disaster, isn't it. I don't think the potential benefits outweigh the seriousness of the potential risks. Apologies everyone for going way off-topic! I'll shut up about GM now. Is there a subforum for GM on this forum?