[kelnos]

Only one anecdotal data point, but:

We use OpenDNS (now Cisco Umbrella) at work. I'm often hit with Umbrella pages denying access to random websites. The usual message is that the site "distributes malware", but none of the sites it blocks actually deserve that block. Our security team says they can manually add exceptions, but they have no visibility into why Umbrella blocks particular sites.

We used Meraki WiFi APs at a previous office, and they were abysmal. We had networking consultants come in several times to do site surveys and attempt to fix things, but we were still plagued with connection drops, poor throughput, and weird dead areas that made no sense. Eventually we trashed the Meraki gear and went with one of Cisco's other product lines, and everything works quite well now. (Well, now we just have issues with macOS being terrible at WiFi radio management.)

I don't have any experience with the other two. I also didn't have experience with OpenDNS or Meraki pre-acquisition, so it's possible they've always been bad products, and Cisco has either maintained status quo, or made them better but still bad.

[yardie]

We use another firewall solution and it happens just as frequently with some sites getting caught up in our malware filter. The initial bad sites lists are originally crowdsourced, I believe.

I've used Meraki, Aruba, Ruckus, and Cisco Aironet and have had no problems with any of them. They all have a duty cycle and radios don't last indefinitely. Usually what I find is someone brings in an old Linksys G-band AP and that squelches an area, the older radios are a lot noisier.