Pros
Almost everyone has their own office (aside from the rotational engineers and corporate marketing engineers, which are entry level positions, maybe a few others). This is nice, but can be very isolating if your team isn't social or your work doesn't require you to interact. Some groups are more social than others, which of course can make a difference in the work atmosphere. People are nice overall though. The company events, bonuses, and benefits are great. Currently there is an unlimited FTO policy, but that translates to about 5 weeks off a year. This may change soon with the acquisition. Overall, this is a great laid-back company to work for.
Cons
Depending on the group, there can be a bit of micromanagement, and some managers are more strict than others. Some require a stricter "time in/time out" or tracking of FTO (even though it's currently unlimited) while others don't. You get more perks (ie: free food/drinks) at work depending on your group. Work from home frequency varies between group as well. There also is a separation between support engineers, engineers for various Mentor products, and the Calibre team (which is treated the best as far as I can tell).