Sounds like you missed the joy of the post-Berkeley FreeBSD/NetBSD/OpenBSD days. In the waning years of my time at college, those BSDs and Linux were all beta-level offerings. Post college and jonesing for my own UNIX-y system to run at home, I tried all of them. Eventually settled on Linux (with forays into IRIX and Solaris in the mid-90s and then Solaris, AIX and HPUX in the mid-2000s). These days, mostly RHEL/CentOS ...because it's what pays the bills. =)
When SMF first came out, it had a lot of teething pains similar to systemd's. Then again, so did a number of technologies in Solaris 10 (and OpenSolaris). ZFS, LDOMs and Zones all had their joys. Being a tinkerer, I ended up finding a lot of "edge cases" (as their Support group liked to call them). Fortunately, the most frequent "edge cases" happened at home. That said, during my (third-part vendor-partner) consulting days, I had to help one large financial institution that got bit pretty bad by a scheduler problem on a SF25000 attached to a large EMC array presenting a few thousand LUNs.
At any rate, haven't really touched Solaris since I sat for my Solaris 11 SA test. Sun had offered me it, at the time, as a beta test-taker as part of their efforts to get people to adopt Solaris 11. Other than helping customers move from Solaris to RHEL/CentOS, haven't really had to deal with Solaris since 2008.
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