Yep. The cool thing is that installing a binary version of a source package is totally transparent from Nix's point of view—it's not a different entity, it's solely a matter of caching. If you're building a package that somebody else built and uploaded to a cache that you can access, you'll download the binary instead. There's a public cache, so when you use a standard package set as your base, you'll be getting most things as binaries. But if you make some changes or something else breaks and binaries aren't available, it falls back to building from source transparently—sometimes this can take a loooong time, but it usually doesn't, and I'd rather have the option to do that than not :).

The other bonus is that it takes very little effort to share your own binary cache—either privately (so that you or your company only need to build something once) or publicly (so that people installing your open source tool don't have to build from source). There's even a really well-designed commercial service called [Cachix][1] that provides a totally turn-key binary cache, including a free tier for open source projects.

[1]: https://www.cachix.org/