They are the most authentic you can get for under a grand. One thing you should beware of, these are handmade and hand heat treated blades and there is no way to guarantee consistant quality when mass produced like this. I have no idea if or how Paul Chen tests each blade, you just never know if a lemon slipt through.
If you've taken Japanese sword instruction the sensei is always careful to inspect your blade before he trusts a student with one for the first time. New swords are carefully tested to make sure they can stand up to the rigors of actual cutting. And an experienced student will regularly dismantle and inspect the sword for signs of fatigue. These safety procedures exist for good reasons, its not unknown for swords to break unexpectedly and kill someone.
In today's world anyone can just buy a katana without any training. If you use it for cutting practice build up to it slowly until you have confidence in the blade and furniture.
You are a fencer so you should know some sword safety basics already. But for novices there really should be some rules of sword safety. Let me post five:
1. Never wing the sword without checking everything around you, this include behind you and above you, to make sure there isn't something or someone in the way.
2. Never point your sword at anything you're not prepared to bleed. This includes your own bodyparts such as legs and feet.
3. Never chop anything you haven't tested on before.
4. All swords can break. They cannot be used like crowbars, do not abuse them.
5. Inspect your sword before every use, maintain it after every use.