I'm very much willing to bet the Solaris man page is NOT grossly misleading, since I know the past and present authors / maintainers of the cryptography framework on Solaris personally :-)
Also, one of the Solaris Security Engineers wrote about random number generation on Solaris extensively just last year:
https://blogs.oracle.com/darren/entry/solaris_random_number_...
Some blogs from other Solaris Security engineers:
Valerie Fenwick: http://bubbva.blogspot.com/
Dan Anderson: https://blogs.oracle.com/DanX/
Darren Moffat: https://blogs.oracle.com/darren
...and last, but not least, Enrico Perla (doesn't have a blog at the moment as far as I know) did author this book and is a Solaris Engineer and someone that works on Solaris Security-related things:
http://www.amazon.com/Guide-Kernel-Exploitation-Attacking-Co...
Okay, you've convinced me, they definitely put in a somewhat weaker urandom. Also that function for getting random numbers with no zero bytes 'for key generation' terrifies me a bit.
Yeah, Solaris has pretty strong crypto verifications thanks to a great security team :-)
I'm glad I could provide useful info.