I wouldn't use it on Linux! Obviously Solaris would be the 'best' place to use it.

But even after a port, the underlying FS will have many more years of production use than brtfs. You might find bugs in the interface between the kernel and ZFS, but hopefully they wouldn't mess with any of the core fs code.

Fully agree there. FreeBSD has had ZFS for 3+ years, and I still see some serious issues once in a while. Beware all new filesystems.