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If it's as easy and reliable as it is with Postgres (and I'd suspect it is), the answer is in my experience yes.

which tool are you using for master-master on postgres?

BDR isn't yet available in core Postgres. Postgres-BDR by a company called 2nd Quadrant seems to be the most widely used / best documented.

It can be installed as a plugin [1] and there are patched 9.4 packages available [2].

I set up a POC with databases in UK and US (east coast) last year. It was fairly straight forward and seemed to work well.

Don't! Not until the next release. We use the 9.4 and it's very experimental.