Minecraft pocket edition app?

Hey so i want to download it on my ipad and its £4:99
Can i ask,
What can i do on it, am i limited, is it one of those games where you have to download a different version to carry on?
Is it a full version where you can do everything or is it some trial thing?

Basically is it worth the money and what's your experiences?

It's not like those games that you always need to add more things that cost money. It's pretty good. It has a lot of features, and is cheaper than the PC or XBox version. It is limited in some aspects, though. The world is smaller, making it harder to build massive things, and it doesn't have a lot of the features that PC and XBox have. It's still pretty fun though; I would recommend it.