I love Mikrotik network devices – I have two of them at home. One which covers 1st floor with WiFi signal and second which covers ground floor and my garden. I have different SSIDs on them, because when I had identical SSIDs it was not working very well.
My friend told me last month about Mikrotik quite new function called CAPsMAN which is doing automatic configuration of APs on all your Mikrotik devices and offers also roaming functionality. Recommended minimal firmware is 6.28 and you need to install Mikrotik package wireless-cm2.
I got it working, but I am still struggling with lower performance (50%) of WiFi when roaming is enabled. Once I solve this problem I will publish also howto for configuration.