I bought a Ubiquity a few months ago, and found out that it couldn't communicate over wireless with a Raspberry Pi's USB-WiFi dongle (with drivers in mainline kernel) sitting 3 meters away. Before I bought it, the same dongle was acting just fine as access point for the whole home network of 3-4 phones/tablets and 1-2 computers; it could easily handle browsing, updating Android/iOS apps, and YouTube video streaming. And it still is doing that just fine after I sadly had to return the Ubiquity!

Now of course this is just my own anecdote. But it remains a fact that WiFi setup can be incredibly hit-or-miss, and there's no reason in principle why two devices 3 meters away should have occasional 2-3 seconds packet delays.

Sounds like you just configured your Rpi wrong.

I didn't need to configure it at all, it just picked up the SSID.

cz.nic isn't risky in the slightest. Ubiquiti don't ship with open source firmware.

It has nothing to do with the firmware it has to do with the fact that they haven't delivered a single working router to a customer yet. You don't seriously believe that buying something through a crowd funding campaign carries zero risk do you?

In this case yes, funding cz.nic has zero risk. They just sent an email saying the first shipments will start this week.