Ventajas
I have worked in the NH design center: 1) Hours aren't as intense as in competitors. You are asked to work harder during peak periods, but in general pace is a tad slower. 2) When things go wrong, projects get delayed, company asks how it can help you rather than beat you over the head. 3) Company isn't public, nor bleeding edge, so attracting talent is difficult. If you are talented, the company will do everything it can to retain you. 4) Although this is group dependent, I found the people working there very personable and friendly. 5) Great place to learn out of school or if you consider yourself "hot-stuff" and want an opportunity to lead.
Desventajas
1) Not a public company, not working on bleeding edge. 2) Main customers are Japanese automotive manufacturers which are very demanding and scrutinize everything but the organization isn't sized correctly to meet all their demands. 3) As in every company of this size, internal politics exist in the upper management. Not the worst I've seen, but if you're not in a core group or politically aligned group, can be frustrating. 4) Company in general is reactive (and they do it very well) rather than proactive. You need to get a counter offer/threaten to leave to get good promotion or retention perks. However, if you do and you are considered talent, they are very aggressive about it. 5) Their product definers are weak: they usually chase existing sockets rather than attack new ones. Rely on Field Apps for definitions rather than have separate product definers as in some competitors.