What’s your take on the Barricade box?

I came across this product called the Barricade box and wanted to get some opinions. Here’s the link to the product page: Lockdown International. What do you think? Is it really worth it or are there better options?

If the assailant has a sharp knife, cutting that kevlar cord won’t be a problem.

Looks like you could easily make a much stronger DIY version using the same idea. It also looks like if there’s any gap, the cord could be cut with a long knife, torch, or even bullets.

How would this be better than a surface-mounted or morticed bolt or door bar?