They are great deals given the price. They would fit in the "real" sword category and will stand up to use. Mind you, katana are not machetes, they are not axes, they are not toys. A good number of people have hurt themselves or others by misuse, abuse, and general goofing around. So please be careful.
Like I said, they will stand up to reasonable use. They are not custom katana, they are not specially designed "glorified machetes" as I call many things, and they fill a niche for lower priced stuff.
They can be reasonably attractive if the oxides of the factory etch are removed, and can rank from OK to pretty good balance, depending on the kind you get. The Musashi and Golden Oriole come with a handle that I feel is generally too long for proper use, but some styles do utilize them I s'pose.
They aren't custom swords or Nihonto, nor will they perform as the higher end stuff does. But that does not make them bad, but generally you DO get what you pay for. And for the price, you are getting a good sword that can cut and can perform admirably, and has a fair degree of customization compatibility.
If you like it, I say go for it, in the price range you likely won't find too much else in terms of a "cutting" sword.
Shinryû.