My experience with the cheap ones is limited to one Caldwell that was given to me. Compared to my Harris pods, it is a bit more flimsy. It does not go on straight, being slightly skewed to one side. I can work with it and get it pretty straight. The feet, when extended the same length also cant the rifle slightly to the side. I can work with it and get it adjusted so that it is square and level, but it takes a bit of work. Once in place and locked down, it does deploy and retract just fine and stays put.
I have relegated it to a .22LR bolt gun. It stays on the rifle, so I don't have to go through all the realignment of the more slopply machined or stamped parts. But, I can say this: If mine is any example, for an "install once and use" without moving on a low recoiling rifle, it actually works fine. Just don't think you are getting a Harris build quality, or that you can easily move it from rifle to rifle.