Vantaggi
ARM is a very balanced company in many ways. ARM has grown to be a mid-sized company, but retains the spirit and flexibility usually associated with start-ups. Upper management changed the structure of the business several times while I was there without replacing all the executives. This was done not in desperation, but to meet the needs of the changing economy by putting people in the best places to keep the company moving forward. It weathered the downturn better than most companies thanks to that kind of agility. The atmosphere is professional, but the doors to the VP's offices were most often open and they invited interaction. A look around the office any time would show signs of the company's fun side. Employees had a lot of latitude to get creative when celebrating holidays from around the world or engaging in spirited contests. Work-life balance is valued at ARM even while hard work is expected. The benefits package is generous in my opinion. I would recommend ARM highly as a great place to work.
Svantaggi
Being a British owned company, ARM sometimes had difficulty bridging the gap between British and American business cultures. On several occasions upper management insisted upon doing things in the US offices the same way they do it in Cambridge when it didn't make sense or wasn't necessary. These kinds of decisions were met with grumbles which took a toll on morale. Upper management's loyalty to other management staff was admirable, but had a down side. They held on to people who were not a good fit for their positions which caused some very good people to leave the company.