Heaven is For Real

My mother had me order in this book for her, about a 4 year old boy in Nebraska who died during an appendectomy and came back and said he saw Heaven and met his unborn sister and his father who died before he was born. She read it in 2 hours and is on my case to read it too because apparently it's one of those that you cannot put down...and I plan to, just as soon as I finish Glinda of Oz, has anyone else read this one and if so what're your thoughts on it?