Turniphead1,
how did you guess that one of my sons is currently at WUS based on my original post? Just curious because you guessed correctly.
I think he is in the right school as homework load is not too bad for him. Definitely, there is more homework at WUS than at his last school (once or twice a week) but very manageable. There is weekend homework where they are expected to produce more in-depth works but they tend to be creative and fun in nature (create a travel guide, create a map of a new city, do a presentation of your own created religion, etc.).
What I see is that for a bright, motivated and curious boy, the amount of work is not overwhelming. however, I guess where it can be challenging for a boy is if he doesn't feel inspired to do any of the projects or find the work level too difficult. for example, the spelling list is definitely more challenging than at his last school but he can tackle it with some thought. I can easily see, though, that the list is challenging for an average 8/9 year old.
In summary, if the boy is smart and loves to learn, he should be able to handle WUS with no problem. More importantly, you, as the parent, are less stressed out because he can do the work. If he is slow to learn new concepts, it will take him longer to perform same task and it will stress you out.