Pros
Abaqus is an iconic product, with great brand recognition and value. Customers treat you with respect wherever you go. You can spend a lifetime and still be learning here. Your first few years as you ramp up on the learning curve will feel great in this company.
Cons
The small company feel is gone after Dassault acquisition. Too much dead wood has been allowed to flourish and some of them are now in a position of influence. If you are unlucky to be stuck under that, good luck ! This is a company which makes arguably the best FEA software in market, but don't really expect that your seniors or superiors really understand technology in the depth that you would expect of a Abaqus employee. Yes that's a paradox and if that paradox is not resolved, this product will wither one day.