if lvl cap is 60, and tiers are separated then forget about wisdom gadgeteer it's nowhere near effective now as it was before.
marksman tier gives wisdom bonus, grenadier str and tinkerer vitality . bonuses are lower now than before . so if anyone is planing on running around trowing grenader with 42% wisdom bonus , think again 'cos u need to max marksman tier, and u'll get around 20-21% bonus , not sure .
if cap here isn't 60 yet, then it's like guys above said it , everythin depends on version of the game.