Pros
The company is doing cutting-edge R&D in all areas of silicon photonics, so it is a great place to work to get real-world exposure to integrated photonics, integrated CMOS, laser design, III/V design, or system design. Working here is like working in an early Bell Labs. The employees are highly knowledgable, technically strong and great to work with, and it's the biggest strength of the company. The lab is also very well-equipped and the office is in a nice location in Seaport next to the ocean. Day-to-day work has always had lot of variety for me. Some days are doing simulations or design, other days are hand-on in the lab, or interacting with customers. I personally like the satisfaction of seeing a project go from a conceptual idea all the way to a working demonstration. It's a good place to work for photonics or electronics engineers.
Cons
Cutting edge R&D means lots of projects, also all work is on-site