That little metal bar gets jammed or hung up on everything when you're pushing the wheelbarrow at any angle that allows the back supports to clear any obstacles; and the single wheel in the front makes for a very unstable load on uneven ground... either pushing or pulling. We end up using more energy struggling to maneuver over/around small obstacles while keeping the whole thing upright, and usually tipping over and dumping the load anyway, than we would just hauling stuff around in buckets or dragging it on a sled, tarp or board.
If your landscape isn't a nice stable, flat, relatively hard-packed surface we recommend that you ditch the wheelbarrow and go with a wheeled cart with wide knobbly tires. Two-wheel tilt or 4-wheel wagon styles ultimately work MUCH better than a wheelbarrow... maybe a 3-wheel tricycle-wheelbarrow hybrid would work.
So, it looks like we'll be repurposing our two wheelbarrows into vegetable planters in the spring, like these from The Micro Gardener!
Note: I'm not knocking the wheelbarrow and skinny-tired cart, they are perfectly appropriate for barn, lawn & garden chores on smooth, stable surfaces... they just aren't appropriate for more rugged backwoods chores on unstable surfaces.