The problem I had is that, beyond setting it up as a simple NAT router, it was too difficult to set up some more advanced (yet not esoteric) features

Information in the forums suggests the problem was limited to earlier batches of the product and mitigating steps in production were taken to correct the issue permanently.

We started having a lot of extraordinarily frustrating problems with Google Drive / Gmail / Google services after installing this.

Since that did not clear the problem I started another investigation into equipment that might better do the job of purely routing traffic.

The worst thing is that I've wasted ~15 hours over the past 8 months troubleshooting stupid problems caused by this that I didn't immediately realize were related to this cheap, buggy hardware.