The team at page zero has been great through our entire campaign! I really can't think about anything specific they've done wrong for us - if you're looking into them as an adwords management firm or someone who needs help with their keyword research/campaigns etc., then go ahead- don’t let me down by being too picky here :) What we like best are how prompt & responsive this group (and others) have always felt when working together during any phases throughout my campaigns' lifecyle so far.
Our current account manager works very closely wih all members within her department but also feels empowered enough not be afraid take suggestions / input regarding new ideas she might want try out later once things get more established i guess? She's even helped brainstorm some fun ways around certain situations which was nice because sometimes these issues come up unexpectedly without timeframes set aside before hand :).