Vantaggi
The only pros that I can think of is that the name 'Thomson Reuters' looks good on your CV, so can help you get a better position elsewhere. Although, I'm not sure how long TR can live off their past grandeur.
Svantaggi
Management have no direction, it changed quicker than the wind and we were always left to pick up the pieces. Senior Management is essentially a bunch of cowboys, who started working for the company when it was still FCBI straight out of uni, and have had no real management or business training. The lack of professionalism is unimaginable for anyone who has worked elsewhere. All company risk is put on the employer, as the vast majority of our pay was based on event commission. The events you were given were strongly based on favouritism, and often sexism, whereby some people continuously were receiving huge commissions (the main reason why they have stayed!) and others get nothing. The culture is toxic and full of bullies. You are expected to work well beyond contract hours, as it is the only way to attempt to make any commission. Next to no progression, people had to almost beg for any sort of promotion, and when they finally got the role, they were only offered £2-5K more despite a doubling in responsibility. The last 2 pay rises their initial offer was a 2% increase which was around £800 a year (given the low salaries to begin with).