dun tink the CPL is something u wan to leave on your lens most of the time.
cus it cuts too much light, and will make the already slow kit lens even slower.
but i do tink its a filter that most photographers will find very useful.
CPL can give the desire effect given the right condition. but i doubt it will dramatically improve the quality of ones photographs. its still the basics: focus, exposure, composition, depth of field, shutter speed... ...