Le Creuset Giant Griddle
I've got one of these and have had it for about 3 years now. They're great and it took quite a few uses to get a nice patina (ie: non stick coating, kind like a seasoning a wok) on it but now that its there it makes the best steaks and grilled veg and fish.
I only really use the grill side and haven't really ever used the flat side although I'm sure one day, I'll get round to making (and affording) a big beef wellington and so i'll need the flat side to sear off the meat.
My only comments are
1) the griddle lines are spaced particularly tight together. More so than what you'd find on their other smaller grills. Not sure why that is.
2) it is quite heavy and doesnt have a heatproof handle so if you've got limited hob/stove space, you might want to think carefully if its the right one for you what you want to cook on it and the volumes that you'll be cooking.
3) Griddles can create a smell so make sure you have adequate ventilation or are happy waking up the next morning with the house smelling of the previous nights meal.
4) I bought this because I wanted to have a really good steak during winter time and not have to wait until the weather improved so I could have a BBQ outside. It makes beautiful steaks with those characteristic grill lines and that makes it all worth it. Especially on a Friday night when you've had a big week, you buy the best steak you can and you grill it to have with a nice bottle of red.
In any event, I am very happy that I bought it and I would recommend it to any friend of mine who was thinking of buying one.