Pros
Fast-growing company dealing in cloud sector, which is booming. Very friendly atmosphere. High salaries, they pay at the top end of the spectrum. Have a very good team. Most employees are academically strong (Oxbridge types) and everyone works hard. You get experience dealing across a wide range of sectors (e.g. finance, public sector, retail, utilities). There are lots of extra-curricular team-building activities (meals and team-building events). They have nice offices. There are opportunities to work abroad.
Cons
You need to love the job! Everyone is warned that they will need to show strong commitment (standard of work and hours when required) and there is high attrition rate in probationary period. Those that stay are there for many years. Management team is small. UK HQ is in Bracknell, which can't compete with nearby London for nightlife.