Polymer lower receiver builds

I have been seeing companies making polymer lower receivers. Some selling complete assemblies for $109.

Has anyone tried a build with one of these?

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I have built up three Polymer80 lowers. It was super easy and I got my gun built with their kit very fast. I found the mill jumps a bit on their plastic and it was tough to make them smooth inside. Also, I never got the takedown & swivel pins to run smoothly. Lastly. The hole for the bolt catch pin is one-sided, so you should consider that part to be permanently installed. The lowers functioned fine otherwise.

I’ve since replaced all of them with aluminum lowers.