i have played in archon when it was C4 and the Interlude server too
like Grisom say, its +50, but the pvp have balance, the problem when the server upgrade to interlude was with the bug of augment actives, in that server the balance dissapear, i remember some chars with 6-7 augment of magic barrier lvl 10, i was playing with sps and i was hitting critics of 15 with +50 weapon xD
anyway, i dont like the buff times, too short for me, and i was expecting to find Cybellin (the buffer) with schemes, but they have only normal buffer
the server is L2J, but is very stable, i think is one of the best C4 servers right now because all c4 servers have crazy donations, this is ok