I have the one in the OP, not the one with the kickstand. I like it. I use it to move hay from my hay garage to my pasture. I am really looking forward to when it is nice out and I am pulling it with my lawn tractor–I will make sure not to back up after reading these posts.
I think dumping a wheel barrow is easier, for the reason listed (harder to get the last portion out). If you are just getting it for poop, a wheel barrow will work better. It would work best for manure from the top of a ramp. But I like having a clean wagon and a dirty wheelbarrow. It is going to be very handy in the summer when I am moving stuff around and working in my garden. I would like to build up some sides, so any advice on that is welcome.
I have no trouble lifting it to tip when it is overflowing with pure, wet manure. I am 5’8." It is a little heavier to pull (even empty) than I thought it would be, but it makes sense, as it is heavier-duty than my wheel barrow. Putting it together took my whole afternoon–an extra set of hands would have been good, but I managed by myself.