Let us not rail about justice as long as we have arms and the freedom to use them. - Duke Leto Atreides
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It would be unfair to speculate as to the build quality of these lowers. However, I've seen a fair amount of problems with polymer AR15 lowers. One broke at the threads for the receiver extension tube when dropped from counter-top height. Another decided to quit holding the mag catch at a consistent height/depth and mags would drop free under recoil. Based on my experience with polymer pistols, I'm confident that someone will figure it out... but I'm not rushing out to beta test one.
CavArms polymer lowers are rock solid.