A small review of the Massa CPL polarizer filter

Lately I bought the Massa CPL polarizer filter (58mm) at DealExtreme, for only $7.89. I'm planning to use it mainly for landscapes, so today I tested it on some skies. First, here's a picture of a sky with the polarizer filter deactivated.

(Almost) the same picture with my polarizer filter activated looks like this:

Pretty cool huh? I think the contrasts between the sky and the clouds make the picture a lot nicer. Just to see the differences in one picture very clearly, I made another picture with the filter halfway in front of the lens.
I don't have any other polarizer filters to make a comparison, but I think this filter does what it should do.