Well from just glacing at the two, it looks like the EZ2 can handle 300 watts per channel while the Herpstat 2 can handle 500 watts per channel. The EZ2 cant do humidity or lighting, its just a heater. And obviously, setting temps is not going to be as precise as you are using an analog dial vs a digital input but that point really doesnt matter as you dont need a 1% precise temp setting. And also with no digital display, you cant just simply look at the display to see the temps. I do like how the snakes eyes are the lights to let you know when its on. And the biggest difference i see is it seems the EZ models dont have the safety relay like the Herpstat 1 and up do like i mentioned.