Vendui wrote on Nov 12
th, 2013 at 9:59pm:
old stones gave 2,040,000 before bonuses, 50% pot, 5% ship, 5% item, 10% vip gave 3,468,000, thus vip bonus does NOT apply after other bonuses, if it did, one would receive 3,590,400 xp instead. they just stack up to a total 70% (75% until the 21s of december) so old stones will give 3,570,000 xp, + base lvl 8 xp to use the stone puts you at 3,978,500 xp, however thats prior to the xp curve.. not sure how much they give now with the said xp curve..
Old stones with new XP curves will give you a base of 1,970,000 (delta from lvl 8 to 16) for a 3rd lifer.
Without the VIP bonus going to 15%, the Otto's stone would have taken you to 3,799,000 - which is 1,000XP short of 20 for a 3rd lifer (coincidence any? The XP curves now align exactly to using a full bonus Otto's stone....).
However, with VIP bonus moving to 15% temporarily, you will go to 3,897,500, which presumable will overflow into Epic XP (hopefully).
And you're right, new stones are much easier to calc.