Ive been on IRC for along time now..and yes its a great chat program. Efnet is an ok server i guess but it doesnt support the NickServ, ChanServ, BotServ commands..Also you cant register your nick so no one can take it. My personal fav. server has to be ScoobyNet. Dont get me wrong, im not saying Efnet is a bad server, but has a few drawbacks..other than that..its great.
The only people i ever see on there is leftyfbx.