Does anyone have experience working with Solidus and/or Spree at scale? I know that Solidus is a fork of Spree, and from what it seems, Shopify is based off of a heavily modified fork of Spree. Couple of questions:

- How easy is Spree/Solidus to customize?

- Why did Solidus fork from Spree? How does this factor into whether I'd pick one or the other?

- Are Spree and Solidus compatible with each other package ecosystem wise?

- Which one has the most traction as of right now? While Solidus seems to be a relatively recent fork, Spree still appears to have more activity. Why is this the case?

To add to that, Spree Commerce: https://github.com/spree/spree