Pros
Essentially none unless you desperately need a boost in your CV. This company particularly targets non-EU students who are searching for a way to stay in the UK.
Cons
Very poor management with an MD who has no clue how to run a company. They offer 3 month internships with no compensation (that is illegal, by the way) and the quality of work assigned is extremely poor, often tedious powerpoints or writing market research reports that are plagiarized from other sources. If you are offered a full time position, there is no base salary and it is just pure commission - this is simply inexcusable, much less in an expensive city like London.