Pros
I'm one of the employees of the flagship store in London, the biggest in the world! Here all the management is really friendly and focused not only on the company businness but also on you and on your development. It's a company where, if you deserve it obviously, you can grow thanks scheduled performance and develpment plans where the management can see your potentials. It's also a place focused on trainings and "test/play/contest" activities that are really helpful for test your product knowledge and for drop down tensions (eg. during seasonals sales, fashion week, financial year's ending..).
Cons
Definately one of the challenges is to remember all the employees names! For different reasons the staff members evolve and change quicker than other companies.