Pros
Good company atmosphere. People in the company enjoy their job and have a passion to improve both personally and their work. Vast assortment of people so their is a group or groups for everyone. Very good social activities and very social and friendly environment. Willing to send developers on conferences, including Droidcon (London) and Google I/O. Experienced developers with a passion for their chosen field. Working with exciting new technologies. Good Location outside of the Expensive London area and good transport links to London (half an hour to London City Centre). Health Insurance and money off Ocado Shopping.
Cons
Wages, for being so close to London the wages are not as competitive to where people use the company as a stepping stone for London work. Company do come across as short sighted at times and are a bit recluse with some future internal changes. Working across different countries can cause communications issues at times as you cannot just walk over and speak to someone.