I bought this set a few weeks ago for $99.99 with a $20 manufacturers discount. The set is now $99.97 without a coupon (apparently a .97 for Costco means a managers discount). This is a a Polycarbonate (PC) set and not an ABS set. Regular ABS sets are heavier and tend to dent easily as well. That is why this PC set at under a hundred dollars is a steal!
I took it to Mexico and this luggage set performed very well. The wheels are very steady and smooth. I can tell that it took a beating during transit but made it out fine. Its reviewed very well and for someone that needs a reliable luggage set this is an awesome buy.