Pros
Many of the 'cooler' problems the firm has get resources absolutely thrown at them - shockingly high rate of senior-middle-management poaches from large well regarded firms who brought meaningful expertise to the issue. Folks are generally kind, competent, and well-meaning.
Cons
'Old guard' from startup days bled out at such an alarming rate that a lot of key institutional knowledge was lost. Too much emphasis on putting the right stuff into slide decks and not enough emphasis on actual, measurable results - many external hires ought to have been internal promotions which exacerbated the above issue with institutional knowledge. I'd imagine this will change over time as the firm gets closer to whatever it is H&F is shooting for, but I left because it felt like there were hugely misaligned incentives for IC's.