What´s your favourite Solaris Feature? And what´s your top annoyance?

So, the article “Solaris != Linux + ZFS” gave me an idea: A series to explain the lesser known features of Solaris. Know i have a different view to Solaris than other people, so i want to start with a small poll:

  1. What are the top three cool features of Solaris 10? (The big three doesn´t count: dtrace,zfs,zones)
  2. What are the top three annoyances in Solaris 10? (every annoyance counts) Please answer with a short explanation. I will collect and count them. I will write about them in descending order of the count of their naming. Update: I will count the pros and cons next saturday.