Pros
five weeks of vacation! sabbatical every four years holidays you typically don't get in the US (Easter, Boxing Day, etc) you deal with EVERYONE in the semiconductor industry while Cambridge-centric for advancement, it is a fairly global company for its size Opportunity to move around between jobs
Kontras
If you aren't in Cambridge advancement can be difficult raises tend to be small regardless of the company's success quite of few people at the exec level are just there because they were at ARM early on, and not really qualified to take ARM to the next level general impression of tightness with money - the silly things like not having projectors in meetings rooms with customers, limited paper/pens, very tight office space can make the place feel a little stressful at times although that has improved somewhat the past few years