I've been putting off the worry about characteristics reaching 90+ for a while now, because I assumed it would be incredibly expensive to reach that high. Theoretically possible, but not practical.
Colour me surprised: Unless I'm reading this wrong, going from 85 (or 89) to 90 (or 94) for a primary characteristic (experience modifier is 50) is a paltry 400 exp. Is it just me, or is this incredibly cheap? In DH1, the last upgrade never got cheaper than 500 exp, and that was only the 4th of its kind - not to mention they were few and far between.
Also, in DH1 the talents and skills usually cost around 100-200 exp. The really expensive stuff reached 300. Upgrading characteristics past the first step started being a real tradeoff, due to the expense.
With talents in DH2 typically starting at 200 and reaching 600 at the end, it seems a completely obvious choice to always take characteristics immediately when available. That's unfortunate, I think.