Lifetime of French press filter
Not all French Presses are created equal; some have the obnoxious habit of getting creases at the edge of the filter, which lead to grounds coming up the sides. Other filters deteriorate more quickly.

My experience is that a fine metal mesh filter tends to last longer than nylon filters, and that I am always going to be unlucky when it comes to the French Press.

Inevitably, things fall apart. Replacing the filter will be needed at some point, though good care can help prevent it from going bad. There are really two ways to look at the investment of the French Press:


You're buying a cheap one with the expectation that it'll last only 6 months to a year.
You spend a little more, and perhaps have to replace a part once in a while.


My suggestion is to buy a mid-priced Bodum press; replacement parts are available and relatively affordable, and their products are decent enough to be used in restaurants around the world. Either way, you're spending less than on a decent drip brewer, and getting a better cup of coffee for your efforts.