If you have access to it, go for it.
Nothing is more accurate. You'll have a breakdown of where the fat is, how much you have, etc. Just remember that it will give you a lot higher number than you think, because it includes "essential" fat (visceral, organ fat, etc).
But, it's a fabulous wake-up call.
Also, you'll see how dense your bones are and if you have to worry about being all osteo-porotic. Don't make us break you.