Other companies make it as well.
It's a really neat tool to have in your pocket, but it does give you waterbased ink a shelf life. The ink starts to get thick and harden within 24 hours of activation, usually resulting in un-useable ink after 10 hours or so.
We used it heavily, but have weaned off of it, now that we have our cure parameters dialed in. Life is way easier now without it. Still useful in certain situations, but overall, better without it.