Pros: everlasting employment for you
Cons: everlasting employment for the worst imaginable co-worker, poor pay increases
SNL does some of the coolest, most exotic engineering you can think of. If you like the work you are doing, you'll love your job. Pay isn't great--1-2% raises have been typical. Management is trained to 'pass the buck' and not address personnel issues, but instead hand them on to the next unfortunate manager. It is nearly impossible for anyone to get fired, regardless of how incompetent or problematic they are. Corporate structure is very flat--there is not a lot of room for upward movement within the company. If you're a technically minded person who loves engineering, you'll do fine. If you're looking at building a career moving up in a company, SNL is not the place for you.