W have a 4 stroke Mantis. It's a great little machine for the veg plot etc. We've got clay soil and as long as it's not too wet the little machine does a great job. It's only any use for small areas though I dread to think how long it would take to do a field! It won't easily break new ground you'd need a much heavier machine for that. I don't think it would be much good to cultivate ground after pigs either unless you could get them off there at the critical point after they'd dug it over but before they've compacted it again. We wait till they've removed all the vegetation then harrow it which breaks it up and levels at the same time.