Bests & Worsts Reviews from Amazon

This is what I've just sent to Coleman customer service: I recently used my son's new Perfect Flow Two-Burner Propane stove. I wanted to try it before buying one of my own. He warned me that it is impossible to adjust the flame and that it remains on high even after turning the knob to low. He was correct. When the adjustment knob is turned to the left to lower the flame it very briefly does just that, but as soon as you let go of the knob it quickly turns back to the right on its own and raises the flame -- as if its spring-loaded and the spring re-coils. This is fine for boiling water. It does not work for frying eggs, etc. Because I had a toolbox in the car, I was able to maintain a lower flame with an extreme jerry-rig using vice grips attached to the fuel-flow knob and a heavy adjustible wrench to rest against the vice grips to keep them from moving, thus keeping the knob from turning back to the right and increasing the flame. I find that to be excessive effort. I have read various reviews online, including here, and it seems others have found the same problem. Then again, many others give it positive reviews. I want to buy a camp stove and I otherwise like the Coleman. But I do not care to go through that effort every time. My questions: Are you aware of these problems? Have you done anything about it? Can I purchase a model that I can be sure allows for heat adjustment from simmer to full flame?