Pros
If you've worked at more than a few places, you'll recognize that overall this is a very well managed company with great culture. If it's your first job, be ready to work.
Staff are hired very carefully, resulting in a bunch of really good people successfully doing their best work together. The company has been extremely fair with me and others; I feel appreciated and frankly wouldn't want to work elsewhere. As an added benefit, the subject matter is really interesting and it's been wonderful learning about the intricate and amazing processes of the body and its systems, down at the molecular and cellular level. More engaging for me than commercials or effects films; it's in some ways like effects work except it's real.
I just looked through the mix of reviews and my main thought is, if you find yourself working somewhere and it's not working for you, move along. I've been in animation for over two decades and this is overall the most pleasant and respectful workplace I've experienced in that field. I recommended it to a family member, if that means anything.
Cons
Some might say the company is slow to bring on new staff when needed. Personally I would much rather be with a company that grows cautiously than the more common company that grows too quickly and then dies when work falls a bit, so I actually am glad to see this. Just expect a thorough interviewing process!