I have 5 of them in and around my home in a CAPSman setup, it's been working great for me.
While they may not offer the blistering speeds you see advertised everywhere I'm able to pull about 250Mbit through them with my Laptop in most situations and my Galaxy S7 hits around 180Mbit.
Realistically, even with those 450$ AP's you see now stating speeds of 2000Mbit+, you are not going to get much more per client. Also it's much more efficient to spread out several AP's throughout your home, creating much better coverage then having multiple radio's in 1 device on the same band, walls and floors still dampen the signal, better to get the AP closer, but that's my opinion about those AP's.
More important, CAPSman works well (once configured), tunneled traffic works well, roaming depends on the client device but mostly works well too and I have about 20 devices connected most of the time (peak was 50 during a party) and the system kept working perfectly. Stability is very important for me because all the lights in the house are run using a self built dimmer that connects through WiFi! No WiFi, no lights.
So for the price and features I think they are great. Again, these are not the APs you are looking for if you want the best transfer speeds possible, but stability and a good price. My GF plays league of legends on our WiFi every day without a hiccup, with lots of other things going on too.
--update
I did some
real world tests with the hap AC here, although that's a different device they are very similar in hardware and thus the results should be identical.