As a Java aficionado, i have a lot of respect for Go's GC. It may not be as sophisticated as the JVM options, but it has a laserlike focus on low pause time, and does a phenomenal job of delivering it, given how much less development effort has gone into it. It's really lit a fire under the JVM developers, at Oracle and Red Hat, to improve the realtime collectors in the JVM.

Not IBM or Azul, though, their JVMs already have kickass realtime collectors.