Pros
Lots of smart interesting young people work in the office from many different countries. Pay and benefits are decent (although not everyone may be equally compensated for the same work). Most everyone is friendly, helpful, and usually thoughtful. Supposedly in good times, the parties can be fun and there is a nice social atmosphere to the office.
Cons
At the top it's an amateurish largely British white boys club and regrettably does not reflect the diversity of its staff. There can be an undercurrent of racial tension because of this and supposed inequitable pay packages. The management would like to making the firm more cutting edge, but their number one priority seems to be to serve corporate interests while nicely lining their own pockets. Design and methods will be compromised to placate the conservative clients. There are very few people in the HK office who have more than 15 or 20 years working experience so it lacks technical depth. In way this works ok as the HK office usually does not do much construction detailing, but then there is the downside of not having control over the detailing means the projects are usually built very shoddily. There is high turnover and can be large layoffs.