Pros
Management tends to say it's a great company with great employees. The Central London office is in a good location with very good connections for commute. It's a nice product and a lot of new positions opening up all the time, so if you don't like your current role, you might be able to change.
Cons
I am disappointed to see such short-sight in resourcing of projects, everybody is working on at least 10 projects and if anybody has 4 hours available on the forecast report, he/she is allocated to a new project. There is constant need to negotiate for resources and they might be taken away on short notice (or no notice). In general PMs need to follow-up on everything as consultants don't keep their commitments and consultants need to do 100 things at a time while 4-5 PMs claim their work is the most important. Management is in general no use at all, everybody manages only "up-wards", direct reports get only the blame and you are among of the lucky ones if your manager talks to you once a week.. and even then you are asked about status of deliverables. Management also shares very little on the company outlook and plans. Previously there were a lot of goodies in the office (biscuits, soft drinks, fruits), nowadays only filtered water and fruits (2 times per week). IT support is practically non-existent, everything is self serve. If you have an issue with your laptop or network access, fix it yourself. As others already mentioned in the reviews, onboarding is a painful experience. 4-6 weeks of video-watching... just get through it asap.. you'll forget (not need) anyway most of it.