I was watching Rachel Andrew talk about CSS Grid Layout yesterday at An Event Apart. Grid is amazing and the day will soon come where it's a dominant web layout tool of choice. That day isn't here yet though, as no stable browser is shipping the latest version of the spec (it's behind a flag at best).
The good news is that, as of just a few days ago, the spec is really stable and has entered "Candidate Recommendation" status. Since all browsers have been developing against the spec, it's likely that widespread non-prefixed ready-to-go support will drop in all stable browsers fairly soon.
The bad news is that it will probably do-so without subgrid support, a point that Rachel underscored well in her talk.
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