I use OpenBSD for quite a few services, but end up using FreeBSD for my file servers (OpenZFS). If the progress on multiple CPU usage and virtualization continues on OpenBSD, the only real thing holding me back from getting rid of FreeBSD is the filesystem. I am looking at the progress of HAMMER2 on DragonFlyBSD to see if it is a good fit.
Ditto for me. I run OpenBSD for a few specific services (transparent SMTP/spamd proxy, SSH jumpboxes, firewall) but mostly stick with FreeBSD for production primarily because of ZFS.
ZFS really is amazing. Before I ever actually tried it, I couldn't understand why people were so amazed by a filesystem. It's incredibly hard to "go back" and I often feel a bit "crippled" when managing machines not using ZFS.
