Just a quick review: When the Ultimato came out, I securely set them up inside the EB's. But when the tomatoes and peppers grew tall, they were pulled out of the box, although planted deep.
The next year I set them up AROUND the boxes, driving the stakes into the ground and they stood firm the entire growing season.
I found this setup to be much sturdier and secure than the mesh string EB kit.
FWIW