Pretty much nothing (wow, weapon colors, sounds when you enter lobbies, outfits, gloves.) it's not worth like 2000 hours. Hundreds if not thousands of people were 25-100 for years and they have pretty much mastered the game, grinding another 475 infamies for I recommend using this mod only if you are good at the game, learn to play and then farm like crazy, trust me, it's worth it. LE_BarnOwl mod: (I used this mod as base) GAB's site: (here there are A LOT of mods for payday 2, I used XP Increaser to get the xp bonus effect) I merged two mods together from two other guys, links just below Once you have done it and the perk deck is equiped you will get enough exp with a Jewerly store at normal with the -30% malus to get 100 levels (even more but 100 is the max) This mod is pretty simple, you basically install it as a normal mod and you need to level up at least the first card of the perk deck.