I've had my B-7800 for almost 3 years and have almost 400 hrs. on it. No problems so far. I thought about strengthening my bucket, but decided against it. I would rather damage the bucket then something else major on the tractor. Remember the weakest link breaks, so if you strengthen that then the next weakest link will break. I did bend the top of my bucket slightly but that was my dumbness when moving a huge rock off a small hill it rolled back and smacked the bucket.
One piece of advice is watch using the forks, it will make the tractor a little light. I had 3 almost new railroad ties (9ft) on mine and only had the 2" receiver hitch on the back and it kept lifting the rear even with loaded tires. The 500 lb box blade settles it down nicely.
Let's see since I've had my 7800, I've used a 5 foot tiller with ease at full depth, used post hole digger and ran it down as far as it would go with a 12" auger and never heard it grunt even a little (clay and small rocks), bushhogged weeds over 6ft. high and thick with a 5 ft. cutter without much of a problem, moved more stone, sand and top soil than I can remember (well over 300 tons), mow with my MMM every week, used 5 foot box blade with rippers set at lowest depth, stretched fence with it, and many many other things.
Biggest piece of advice is keep the wife off it. Once my wife got the hang of it she wants to use it all the time.