All cross-drilled rotors are prone to cracking that is why most brake professionsls do not recomend them for street use. These are the guys from Brembo, Baer, etc, who are making the best brake systems you can buy. You can imagine what kind of quality you are getting from brand-X made in China, etc. I would be less worried about the lead paint.
Slotted or dimpled rotors are sufficient for street use, and even they are not necessary for good braking. As previously stated, good quality, aftermarket brake pads, good quality rotors, fresh fluid, and if you want to go an extra step for more positive braking, add some braided stainless-steel brake hoses at all 4 wheels.
I you really want some braking power, get some of them 13" rotors with 4 or 6 piston calipers, and the braided stainless steel hoses. Of course that will set you back about $3000 not including the new 17"-18" wheels and tires necessary to clear the larger rotors and calipers. But heck, it's only money. :blink:
...Rich