I'm currently waiting for a RB2011UAS-RM ... my distributor changed availability from "about 1 week" to "delayed" after my order. looks not good.
it would be nice if mikrotik say something about there all these availability problems.
I rather have a manufacturer which give a honest "bad" news like "it will take some time due to what ever reason" than let you with an unknown status over weeks/month.
Even in projects where you don't need the hardware immediately it mess up the project planning if you don't have an approximate timeframe.
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Certifications: ITILv3, GCIA