I have this luggage set and it's quality is good enough for me. Of course it's not as good as some of the stuff you pay 100's of dollars for, but it works for me. The only thing I don't like is that the medium sized roller bag isn't all that big. Also, the metal poles that let you pull it aren't all that sturdy.
I got it for free after ordering over 150 dollars worth of stuff from staples... so it was worth the price I paid
For 30 bucks, I'd say you're not going to find a better deal.