I have the 47LM4600 and it is a pretty nice TV. Yes, it's not a SmartTV but I already have a PS3, xbox360, wii, 2 tablets, computers, laptops, etc... I don't need a 10th way to update my facebook. The picture quality and color is good. The black levels could be better. I don't notice any back light bleeding during normal operation. Only in a dark room with a pure black screen; even then it is barely noticeable. I paid $550 for the 47 inch version and I'm happy.
PS: I have a 5 year old LG LCD that's been used for at least 8 hours everyday and it still works perfectly (only the power LED light went out). I've never had any LG problems but that could be just luck.