I received my Brownells-branded slide parts and Polymer80-branded frame parts today. I'm pleasantly surprised how decent everything looks. I thought the metals would be rough and the plastics would be cheap but everything looks good. I removed some plastic flashing and burrs here and there but OEM Glock parts need the same thing so I'm not knocking these aftermarket bits.
Of course, it couldn't be problem-free. The trigger return spring is missing and I received two mag catch springs so that's going to need to be sorted out. We'll see how Brownells handles it.