I doubt that those little aerators at Home Depot will be off much use but on the softest of soils even with bricks piled on top. They are extremely light duty, I have seen the tines bend over on them and are in no way suitable, my opinion, for use with a compact tractor, kinda like underkill on the implement.
Yes, I found that working implements for compacts etc are pricey compared to the lawn and garden tractor stuff but why have a "real" tractor to tow toy implements.
Consider that a MMM costs 2,500 dollars or so--more than a complete GT from Home Depot---sticker shock /w3tcompact/icons/shocked.gif -- get used to it, unfortunately.
The thing that is attached to the tractor in the bottom pic is a tine harrow, I love that thing.
J