Pros
They take time to train and invest in their employees, you visit different sites, have fun team building activities and get an in depth understanding of the company and their overall goals. They give you some freedom to work from home or take a break if needs be, my manager did anyway. At one of the reward ceremonies Sean Zimdahl the CEO gave an inspiring speech about speaking up and putting your own ideas forward. I often saw him in the Holborn office and he seems very personable and genuine. The office environment is young and hungry, they play music and ring bells if someone reaches their target which is nice. There is fruit/tea/coffee and a lot of free lunches, when you join the management team take you out to lunch
Cons
Although the training is thorough it is quite factual and theory based but most of it does not apply to the day to day tasks and it was extremely disorganized in terms of practical training. Everyone seemed to have their own way of doing things which made it hard to learn as every member of the team would show you a different technique. Heavily male dominated, not really a con just a heads up