The few hours I spent with this free trial version have impressed me and I will definitely be buying the full version in the near future. It's extremely fun and addictive to build your own game world, characters, dungeons, and more. Check it out - it's free. You've got nothing to lose.
This trial version is obviously pretty limited, so I was only able to create a very small and quick game with a little map and a few NPCs and monsters. But it gave me a good feel of how RPG Maker works and functions.
The interface is very well designed and detailed. Spend a couple of hours with it and you will get the hang of it. I was able to create a small game in about 4-5 hours. It's very intuitive and user-friendly, and there's plenty of help menus.