Although I am only photo beginners, but I am satisfied so far with the filters. In a direct test with an even light source, but covers the more expensive polarization filter slightly better. However, only minimal. So I would say as an entry-level collection this one is thoroughly recommended.
There is also a small pocket so. That's nice, but to me it is personally too large. In the more expensive filter a plastic box was there, where the filter clean fit exactly and was also protected from dust. In the enclosed bag here indeed fit in a total of 6 filters, but so really protected from dust they are not there.
CONCLUSION: A decent starter set. Professionals but surely turn up their noses and buy filters that already cost five times alone ..