I've been browsing eBay and have noticed a number of Gillette models (Fat Boy, Slim, P3, M3, SuperSpeed, Aristocrat, etc.). What are the virtues and drawbacks of the various models; why do love or not like any particular one, and what are the other notable manufacturers out there? Some of the Rhodium-plated ones look incredibly clean for their age. Pretty fascinating stuff, and I see potential for some AD.