Disclaimer: I received a review copy.
This product presents a brand new 5th edition class, the Kensei. If you are familiar with chanbara film and storytelling, or the classic samurai/ronin tropes, then this class is for you.
First off, this class is not tied to a katana, which is great, since it already bypasses the typical fanboy urge to make the katana more important than the character. you can use any weapon, and have a backup in case you need to use another weapon. This really goes against the grain for a lot of classes that focus on a single weapon as this product does.
This class comes complete with archetypes (or ways) that really seem to make the class shine. There is an impressive spellcasting class that can make you something of a samurai paladin, one that focuses on your blade, and one that focuses on your body as a tool to be perfected.
If I had one complaint about this product, it would be the layout. It isn't that bad, but I am spoiled on layouts that are a little neater or readable, and when I am referencing a class, it helps to have neater layouts to facilitate in cross referencing. That having been said, it was not so bad as to deter me from enjoying it.
The Kensei stands to be an excellent jumping point for any samurai or wandering swordsman templates that you may want to play, and is a solid entry into the so far untested waters of 5th edition base class creations. It stands apart from Fighter enough to merit a new base class, and has done a great job of presenting itself as distinct and impressive. 4 out of 5 stars.