During my first year of ownership my bucket got worked real hard. Mostly land clearing, digging stumps, pushing trees over and popping the stump out with the lip of the bucket. I had cracks forming where reinforcement angle iron goes across the back between the loader arm attachments. I think this was from torquing the bucket by hooking one corner of the lip under stumps. Got it re-welded and it has held just fine. Lower edge of bucket has a slight 'smile' to it. Top edge is bent slightly from pushing trees with it....don't do it, its weak, use the lower lip instead.
But, even after all that it pretty much looks normal (like a 3 year old bucket) and functions normally and will probably last many more years. From the build of it, I'd guess its pretty light duty.
I should have gotten a tooth bar years ago. Still don't have one.