Visico CPL filters, are they any good?

Hey all,
Are Visico CPL filters any good?
I have found some on ebay for around the AUD $25-29 inc postage.
Other than the listing saying they are a CPL, there is no other details provided except for the size.
So comments, any one used them on a DSLR?
For $25 inc shipping I think I might have a go.
Are Visico CPL filters any good?
I have found some on ebay for around the AUD $25-29 inc postage.
Other than the listing saying they are a CPL, there is no other details provided except for the size.
So comments, any one used them on a DSLR?
For $25 inc shipping I think I might have a go.