Pros
I worked as an analyst in Pace's Lab Operations division for a little over a year. Lab Ops is Pace's analytical staffing division, so I worked offsite for a client of theirs. During my time, I was given the distinct impression that Pace is a company that truly cares about its employees. There is an openness and genuineness to the company as a whole; I felt as though I was valued and all of my colleagues were talented, hard-working people with whom I got along very well. Pace is a transparent company - its CEO regularly updates the company as a whole with business developments and financial progress. I was given the impression that Pace is managed very well at all levels. I highly recommend Pace as an entry point for young chemists.
Cons
I can't speak for Pace's other business units, but Lab Ops is ultimately limited by it's own model of contract staffing. This is nothing against Pace itself; it is just the nature of contract staffing as a whole. When it comes down to it, Lab Ops simply cannot pay it's employees well enough at the entry level to prevent them from going elsewhere. Again, I don't see this as Pace's "fault", necessarily. Pace is definitely competitive with other "contract houses" at that level, but almost any full-time offer for someone with 1+ year of experience is going to be for a substantially higher wage (this was my experience). That said, it was still very difficult for me to make the decision to leave Pace because it was, truly, a wonderful place to work.