J.M.
I have the Step2 sandbox and picnic table combo. It only has seating on one side of the table because the other side has the sandbox. I came with an umbrella too. We've had it for 1 1/2 years and its held up great so far. The table and sandbox have not cracked or faded or anything. It still looks new except for the sand my son has gotten in all the crevices. The unbrella needs replacing because I just left it out in all weather all the time. But I know I can get just the umbrella by itself to replace it.
Little Tykes has a table with 4-side seating though and claims to seat up to 8 kids and does have an umbrella. I don't know how durable it is though.