Pros
Not all departments hire and fire as regularly as others, and sometimes you get to leave a little early in the afternoon and get one or two free drinks. The standard to which new employees are hired is very low. If you're looking for a stopgap job for a couple of months this might be a good place to start. As the employee turnover is so high, it's a good place to build a network of Prysm alumni to leverage later on in your actual career. The central Bristol office is conveniently placed and has good access to transport, shopping and culture.
Cons
Very loud music (80dB +) is played all day, every day. Constant foul language is used by senior management in the course of normal conversation. Multiple women I have worked with have complained about specific incidents of sexual harassment in the workplace from several specific members of management. Female staff have been lectured en masse about wearing revealing clothing and personal hygiene. Male members of senior management frequently stripped down to their underwear in the middle of the office before and after lunch, to put on and take off exercise clothing. One former colleague told me that he was given a promotion on the grounds that he lost weight. While possibly well-meaning, this is discriminatory. No kitchen or even drinking water available. Staff are expected to bring water to work and fill their own water bottles from the taps in the quite grubby toilet. I personally tried to have a water cooler installed and was promised constantly, over the course of a year, that it was just around the corner. Intimidation is used freely and encouraged by senior management. More than once I received a public dressing down by managers in charge of adjacent teams, for bringing up issues such as an arbitrary change in my working hours with no notice, and questioning a request for salary information from a manager who was not my direct line manager or HR. I was threatened with consequences for "rocking the boat". There is very little in the way of pay rises. Staff get promoted up through the ranks very quickly, apparently with token pay increases, until they reach junior management, where they're burned out and leave to better-paid work elsewhere. This has the drawback that a single team may have multiple managers in a single year. I witnessed a whole group of marketing staff taken into a group dismissal meeting just before Christmas 2017. As a designer, I expect to work late into the evening to make sure that print deadlines are met. Fortunately, with a little organisation, I didn't need to do it that often. However, staff in the sales side of the floor are expected to put in multiple hours of unpaid work every day to meet canvassing targets.