Cool piece of machinery.   About the only thing I think it's good for would be clearing rights of way for transmission lines and other electrical lines.   You can't use it to clear out for construction - the debris is horrible due to attracting termites, carpenter ants, and other unwanted things near structures, and creates other problems such as tons of mushrooms (likely poisonous) as they decay.    You can't build on it - organic matter like that should never be used in solid fill.   You wouldn't convert a lot into a field, because you would want those stumps out of the field.   I suppose, if you were trying to convert some light forestland back into a meadow for deer and other wildlife, it might work for that as well.