I got the 1/2" thick 60" x 20" 3 pack. Every piece is almost perfect. Barely any noticeable warping, very sturdy for being 1/2". The corners were kinda smashed from shipping, but I don't really see any way around that happening. The package was pretty well reinforced, but when you mix a big courier like UPS and a heavy package, something's getting damaged. Plus the damage is so minimal it's gonna be a part of my cutoff waste anyway.