Dewalt 735 knives

Just wondering if any of you have bought any 735 knives from a different source other than Dewalt and have any recommendations. It seems like I change the knives more often than I do my socks because of the poor quality. A couple of suppliers, Infinity being one, claim their blades last 5 time longer. They also have a single edged knife they claim has a 10 times longer life. Any thoughts would be appreciated.