So can anyone tell me what is the big difference between the Detroit EZ locker, Genuine Gear's Quick Lock and the Power Trax Lock Right ????

As far as I can tell they all appear to be the exact same thing.
All three require little or no mechanical ability to install.
All three replace the spider gears.
All three appear to be identical in design.
And they are all in the same price range......

So what's up with that ?