Limited sick days, no work-from home, and therefore not a great place for single parents. This is such a specialized industry that there is little to no opportunity for your skills gained there to transfer to another job.
This is definitely a "traditional" company. They value the company hierarchy and make sure you know your place in it.
To me, the biggest Con at an otherwise amazing company is that some of the older staff are uncomfortable with diversity. It can be an oppressive or at least awkward environment if you are not a white, heterosexual, politically conservative, Christian. This is not true for most of the staff, but the few who are intolerant of others unfortunately tend to be in positions of power and excel at keeping their bigotry in check on paper and when upper management comes around. My suggestion is that if you decide to work here (you should!), don't divulge personal information to anyone over 50 until you really get to know them. Or you could just wait a few years until they retire!
The organization also lags behind in technology and many older members of staff fear change because they don't want to have to learn anything new. Updates are being made (like computers were finally upgraded from Windows XP to Windows 7 in 2015).
Middle management seems to be threatened by competent subordinates as well as technology they don't understand, but I believe with the new CEO in place that could change.
I know these are some big cons, but if you can look past them in the meantime, this will be a great place to work within the next few years.