Pros
The group I worked with was fantastic. All were intelligent, creative, hardworking and easy to get along with. The company has gone through rapid change but also rapid improvement. Hologic is fostering a dynamic environment where hard work and creativity are recognized and rewarded. Additionally, the company is consistently growing and looks well poised to do so in the future. The company also recognizes that with growth, additional investment in its people and systems is needed to support that growth. Hologic has stepped up and is working to meet those needs in a real and demonstrable way. In summary, Hologic is a good place to work with a bright future.
Cons
As you can see in other comments, there has been a lot of change in a short amount of time. While change can make some people uncomfortable, a culture of continuous improvement encourages new ideas, can create individual opportunities, and ultimately is required for a company to continue to grow.