I bought a set from Agri-Supply, and they have been wonderful. I've had them about 4-5 years and still look just as good. I've had close to 2000lbs on them (which is their weight rating) and they hold fine. I also use them as forks on the front of my loader and get them into all sorts of stuff and angles & they haven't bent yet and I don't think they ever will. They are heavy rectangular tube with nice solid welds tapered tips that are welded shut, I think they may even have a powder coated finish in bright red. I don't recommend products much since I never know if I just got lucky on a product and someone else's experience will vary, in this case, I think they are a solid addition to your attachments, especially for the price. (just looked on the website, they are only $300. US)
Only down side I've found is, due to the thick painted finish, they are slippery when wet. Which is a small trade off for the durability. If I need to I can add non-slip grip tape to the top side of the forks.