Pros
DCA get some good projects, have hard working staff who are passionate. There are benefits, such as half day Fridays and paying overtime. Some of the Heads of Practices are great - they have a great track record, have worked internationally at some of the biggest consultancies going and are very clued into what is happening in the industry. Despite the cons outlined below, they still do very well financially in comparison to other UK consultancies.
Cons
The benefits of DCA are in competition with the Heads of Practices - during my time there I constantly felt that there was a fight between the Heads (who I respected and was definitely inspired by) and the Management (who I was bored by, who had old thinking and who also didn't even know my name). The real problem at DCA is that there is very little 'fresh' talent. There are people at DCA who have been there for 20 years - while this is good in some respects, there is a very 'content' and 'good enough' culture, not exactly inspiring. It also means there is a tired way of thinking about design, one that is simply not the way the industry is today and is why it is unlikely that DCA will ever be a true competitor to the big international consultancies.