Pros
Had fantastic career advancement and learnt far more than I would have in most companies. It is quite an open culture and where I am (Global WorkPlace Solutions -UK) everyone is friendly and willingly to help those that want to develop. About to be sold to CBRE, this should bring very positive change as parent company do not align or understand the industry.
Cons
career advancement its there is you want it, but quite often (more so recently) given to those that know the right person. Constant change - the change is actually for the right reasons but poorly thought through it terms of rolling out as a project. No really planning done just decide on a change and they figure out how to get there, which can make it difficult for employees. Constant reduction in employee headcount has lead to a more competitive less collaborative culture that I encountered when I first joined.