Yes, there are basically 2 builds for every architecture. One is glibc, the other is musl. I haven't used the musl builds that much, just toyed with them a few times (mainly because of lack of software), but if you only use open source software that doesn't specifically depend on the GNU toolchain, yes, you can daily drive it, no doubt there. And yes, it is faster than the glibc builds.
Faster, more stable, no systemd, supports musl and architectures not usually supported by most distros. It's probably the most stable rolling release distro out there.
Not just musl, software that depends on systemd (or parts of it) as well.
We also need to patch binaries as well sometimes π. It is fun though, cutter and/or iaito are great tools.