To echo what Walt said above, there is absolutely nothing wrong with these so-called economy chassis. They’re fast. You can win in them. They’re good karts.
It all depends on what you want to do. They might not be the ticket if you’re gonna do some big national/international race, but they are perfect for club racing where you’re racing for fun, experience, and laps. All without spending a lot of money.
Economy chassis can also be upgraded over time. You can pick up those fancy components and add them as your competition…and pocket book…dictates.
Again, it all comes down to what you want and need to go racing.