I bought an entire gasket set from Apex and they seem to be of good construction. I wouldn't try to hit 20psi on a head gasket from them though. I compared mine to an OEM gasket and they are identicle in shape, thickness, color, build, everything it seems. If you're trying to just get your car going again then go for it.

BTW, I have used apex gaskets for a long time and on a variety of vehicles because of their price, and only one vehicle had a water pump gasket fail.