I remember when two engineers on our staff at $BIGCORP test-drove Git for a month and then gave a lunch-talk about their impressions for anyone who was curious about it. They were in favor of switching to it for local / team workflows. At the time, there would still be a translation layer back to our pre-Git company repo, but they advocated for the extra overhead for the gains in new workflow possibilities. You can guess what happened next.

Git had only been around for a handful of years at the time. If not for people slowly adopting it a little at a time, thus leading to the network effect, Git would not have become the dominant VCS of the day. So yeah, when things like this, JJ, etc come along, it's worth paying attention and keeping an open mind cause any one of them might be the "everything else is irrelevant," tool in fifteen years.