I use this. My old front wheel wheelbarrow just holds my pool cover in the summer, I hardly use it for anything.
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I can walk the recycling, pick up sticks, carry potted plants and go up and down the inclines without worrying about side spills. Attach to lawn tractor, put saws and stuff in when working close to house.
I never mix cement or anything that would be more wheelbarrow specific. Though my 4 wheeler has carried quickcrete bags to put in posts.
So far, 6 years in and no flats, though I know it will happen eventually.
Regular wheelbarrow tires started leaking after about a year.