Congrats on the launch. As a fellow Ruby/Rails developer I love seeing great open-source Ruby/Rails apps in a world where everyone seems to be trending to what's "sexy" now instead of what's tired and true.
You'll never make everyone happy... For me the fact that it's RoR as opposed to, say Go or Elixir is a big turn off, because I know it will be slow and eat up lots of RAM.
For me tried and true would be Java.
Stack don't matter, it's not the wand, it's the wizard and time makes fools of us all.