I love iChat. I use it with all my mac and PC using friends. I guess it depends what generation you are from (I'm 18), because when I was in middle school AIM was the biggest IM client out, so all of my friends have been using it since. I also use iChat to talk to al my recent switcher friends in the Architecture
Stuido at college. Ive done a ton of 4-way video sessions w/ friends. I know about some people who have ahad ichat and NEVER did a video conference
However, that being said, i dont like how you cant appear "invisible" on iChat. I heard the next version that comes out with leopard will, though