My understanding is Cake was used for the 1st and 2nd generation, but all the Wi-Fi 6 models of eero (6, 6+, Pro 6, Pro 6E) use fq_codel. It’s optional, off by default, and hidden under eero labs as a beta feature under the name “optimize for conferencing and gaming”
No idea what usage of that feature is like, but there’s a lot of chatter about it on r/eero, mostly positive. That subreddit is probably more technical than the average eero user though.
You might have more reliable results with 40 MHz then, or with moving to a DFS channel. The U6-Mesh definitely does run hot, but most UniFi APs do. The U6-Mesh does seems the hottest-running of the dozen plus models I've used though. I know some people have had to RMA them, but it's too early to know if that's a real problem or not.
Especially in mesh kits which are usually operated without Ethernet backhaul. eero themselves claim 90% of their deployed networks don't use any Ethernet. Hence, almost all mesh kits use USB-C or a DC barrel connector.
I did see occasional spikes to the range, 1500-1600 Mbps, and I've seen that with the few other 6 GHz APs I've tested. The eero's performance on the top end with a very wide channel was inconsistent though. Over longer duration tests those spikes to 1.5 Gbps+ evened out to what I showed in the charts. This is early firmware though (6.9.2, the release version), so things could improve in the future.
That hasn't been my experience with the U6-Pro and U6-Mesh. Are you running 80 MHz channels? Do you have a lot of 5 GHz interference around you? I'm typically seeing 500-800 Mbps on the top end, from close range, with those APs. That's with a relatively clean 80 MHz channel though.
In my experience, very well. I only tested Google Wi-Fi for a few weeks, but I was unimpressed with it overall. eero does a good job at adjusting things behind the scene. It does an RF scan nightly, and adjusts channels and works around interference better than any other mesh kit I've tested. Most just pick a wide channel and broadcast as loud as possible.
No idea what usage of that feature is like, but there’s a lot of chatter about it on r/eero, mostly positive. That subreddit is probably more technical than the average eero user though.