Students generally help each other a lot, and there is not a very high sense of unfriendly competition among us. Usually, if you have a question, you can find some graduate student who is knowledgeable and is willing to help you out. The graduate students are very supportive of each other and we all get together to celebrate when any student passes their qualifying exams, orals or their PhD thesis proposal and defense. In general, students get along with the faculty. There are of course, as with anywhere, some personality conflicts, but we all try to keep the atmosphere professional and not let our personalities get in the way.
Most students get along well with their advisors or they change advisors.
This is sometimes difficult because we are not a very big department and changing advisors often means changing into a different field within astronomy. We have plenty of workstations, CDroms, tapedrives, etc. We are also slowly evolving into a system run by PCs with Linux. It is usually pretty difficult to NOT find a computer to work on. Many students have computers in their offices, but there are also many public workstations.