Timing Chain Tensioner Question?

This is one of those questions that have very smart people who build engines for a living on opposite sides. I decided to run a tensioner. Installed it and ran the motor for 4-5 years. Pull it apart to change pistons and the tensioner was completely broken. The guide was broken in half and it was NOT worn through. The flat spring was trying to eat its way throuh the side of the timing cover. I will not run another one. This is just my personal first hand experience. Buy the best timing chain you can find and keep an eye on it.