Pros
Great-west is fantastic in terms of its demands on you. People rarely work more than 40 hours (except a few depts, which seem understaffed) a week so it's really great for people with families who don't want to focus on work. This is an incredibly fiscally conservative company and so there is no history of layoffs.
Cons
If you are motivated and ambitious this is not the place for you. Our average raise this year was 1.75%. It is in the company policy that you can not get more than 10% a year, even for a promotion. So if you get a 1% merit increase you can only get a 9% maximum raise if you get promoted. I know this goes as high as VP. Not sure if it's applicable to SVPs and up. Also, you might expect an employee benefits company to provide great benefits for their employees. Great-west doesn't. I have heard it costs appx $5,000 out if pocket to have a baby. And our 401(k) plan is unbelievably average (4% match, no profit sharing).