I am looking at getting some new tires. I came across the MAXXIS XENITH UN CATEGORIE TIRE for $9 a piece. Just wondering if anyone has had any experience with these tires. The tires I have been saving up for are the Vredestein Fortezza Tri Compe in a 700X25. Is there a huge difference in quality, performance, anything? The $30-40 difference in price per tire is a lot. Just wondering..... Any replies would be helpful.