said by KoRnGtL15 :

Best to set it up manually if you are technically inclined to do so. That button is for people that know nothing about networking and want simple things in life. Also depending on what settings it uses when pressing the button. It is more likely to be cracked. My router does the same thing and it probably defaults to WEP for encryption. WPA2+AES is best for home use and most secure for wifi use. Which is what I use currently.