Pros
Opportunities to work with some of the biggest names in Aerospace(Rolls, GE, Airbus) in some genuinely challenging projects (though they are few and far between). Onsite opportunities at customer locations across the world. QuEST is a fast growing company with a good set of internal processes and healthy financials. You can build a good career here if things work out.
Cons
QuEST just cannot keep hold of good engineering talent because of their culture. If you are lucky enough to get a manager who understands that solving complex engineering problems doesn't always look good on the bottom line, you will enjoy your work. But more often than not the bottom line rules and as a result talent is not sufficiently rewarded and encouraged and good projects are lost. Good engineers are made to work on mind numbing work and get disenchanted. While QuEST claims to be an engineer's company it is not except in parts. Archaic HR practices and salaries below industry average don't help either. There is a strong sense amongst employees that QuEST really does not care about its employees.