I use the George Foreman Grill within my university kitchen. It is a versatile piece of equipment and as such has become a very important part of my culinary lifestyle. Whether grilling waffles, gammon, bacon, or even steak, the Foreman is at least a reliable piece of cooking equipment. And it is easy to use. It turns on and begins to heat up with a flick of a switch, and requires no more attention than an occassional flip. After cooking, its second advantage becomes quickly apparent: it is very easy to clean. A quick rub down with a damp sponge and presto: its ready to be used again.
One issue I have found with this grill is how easy it is to leave on and thus burn yourself and others on it. However this is a very mild concern, and one that affects nearly all cooking anyway. It is a problem on par with leaving a hot baking tray or saucepan upon the hobs and thus I would strongly advise people not to be detered from buying it for this reason.
One significant problem is the quality of food prepared with the Foreman. It does cook, it does taste nice and its is healthy but it is not always as hot as one might hope. This isn't an issue if toasting a sandwhich, but if using the Foreman to grill the meat, or if cooking for more than one person, this is a problem. And it is a problem made worse by the potential lack of a warm over to keep already cooked food warm. I feel that, for this reason, the grill is probably preferable after all for any complex cooking and if its available. The Foreman's use seems somewhat relegate to simple snacks. Not useless, but slightly limited and there are cheaper products if a .sandwich make is what you're after.