the extcy retailed for about $300 new.
the ego retailed for $1,200 new.
the ego is a tad bit nicer
but make sure you read the manual and learn how to take care of it. if your friends buying it used and it doesnt come with one, make sure to download it from planet eclipse website.
seriously, it can have some expensive parts to replace if you don't. but ego's are one of the most reliable guns out there. usually all they need is a wipe down after play and a little paintball specific oil on the ram every couple of cases of paint.