it appears more expensive,but consider the fact that you change cartridge much less often than other filters.
also, if you want to get the Cadillac of filters (although i have no way of knowing if the claims are true) listen to the interview of Robert Von on http://www.oneradionetwork.com
. he says his filter even takes out the fluoride, which no shower filter supposedly do...i cannot give you a link to his filter cause its not on the internet, you need to contact Robert Von directly to get one i believe... here is his website: http://robertvon.com/
good luck, and if you do try this filter out, please report!!