It depends on where you work in Symantec. If you are in a non-technical role, run! For Sales the life is tough and most of the Sales people in Emea legged it immediately.
Broadcom does not do benefits. They don't have a company culture. They are , and I quote, "in the busness of making money". Everything and anything comes second to that. They have no allegiance to a specific office location, business unit and will not take on any other companies culture or values. You have the choice to join them or leave.
They will increase your base pay, they will give you a fixed bonus depending on your job title (from 5% to 20%) plus a multi-year RSR grant that depends on your job title.
The will treat you like a number, and all people I know that stayed treat this as a job but not as a career.
There is no innovation, there is no progression. You do what you do until they no longer need you. There is no lateral career movement and that means if your business unit (CA was cut into two units, Enterprise Software and Mainframe) does not make the money they expect you will be cut or sold along with the business. They would not move you to a similar position in another unit no matter how brilliant you are.
At CA, even before the final agreement was announced, you swiftly saw the innovators and high profile managers, software architects and Sales people move and take positions at other companies.
Managment will be cut to the bone and managers are constantly overloaded. Which means little oversight but also little help if things go southways. The HR department is appaling and has little knowledge of local laws and requirements, which caused them to have to pay more redundancies than they originally expected.
So in conclusion, of you are in it for the money alone, or only have a few years left until retirement, I would stay. Otherwise I would leave because I cannot see anyone have a longlasting fruitful career there that keeps up with the latest technologies.