I have MR55s installed in two different environments, Cisco 3850-24UX and Meraki MS355. Both switches are provide 5GB to the APs with 20GB to the core. my.meraki.com loads significantly faster but I'm not seeing any health reports coming back into my dashboard. I have clients reporting improved connections and quicker access. My webex sessions appear to be less jittery as well. I would say if it's in the budget MR55s are the progression to go to. I do have MR53s as well that are rock solid. I'd splurge. Also note on the firmware side they run beta currently, so putting them into their own network is highly recommended to stabilize the wifi environment.
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