Well a pro to the lockout would be you can keep whatever implement you are using at the height or depth that you want it at so your implement can work how you want it.
A con to the lockout would be that its much harder on your machine in some cases. You can end up bending, snapping, shearing, or breaking things.
Certain implements actually work better while in float. Two examples are plowing snow or snowblowing. You want the plow or blower to follow the contour of your driveway. Now that same front blade that benefits from floating while plowing snow would better off locked if you were using it as a dozer blade in dirt. So pretty much it depends on your implement and how you are applying that implement to your task.
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 Quietline 1250
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