I wonder what you mean by HA. One disappointment was to learn that you can't do firmware upgrades on the switches without a downtime. Example: you have 2 core switches (MS425) stacked you have a bunch of access switches, all of them connected to both core switches, LACP set up and so on each core switch has an uplink to the firewall/router etc. You would expect that you can do a firmware upgrade where only one of the core switches would reboot at a time, thus leaving the whole network operational, but no, this is not supported - you can try to force that using staging, but this is not a supported scenario and the Meraki Support doesn't know how this will behave (I tested that and got mixed results). Obviously rebooting access switches and loosing the clients behind them for a while is expected. In classic cisco world the missing feature is called Rolling Stack Upgrade.
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