PUR or Brita have always been recommended, I don't know much about your model but that doesn't mean it isn't good. Try a consumer reports review about which is best.
Absolutely worth every penny!! I'm almost surprised when I see people still using plastic bottled water on a daily basis. Horrible for our landfills. Even recycling costs our economy $$$ so filters are the way to go!!
Also, I read Ozarka & Dasani are no better that tap water. I've also read the number or cities/states that violate the water regulations is sky rocketing. That tells me our water is getting worse and worse.
I even use a shower head filter for my kids baths and my showers. Dr. Oz did an entire show about water quality. See if you can view it or read about it on his website. He recommended a water filter for your shower head as well. Bathing in hot water that has toxins in it has been to be reported far worse than actually drinking tap water. Your body absorbs the VOC's (volatile organic compounds).