Pros
Yankee Group used to be a GREAT place to work, however, it's long past it prime. It still has an OK brand, although not what it once did so it looks good on a resume of someone right out of college. A few smart people remain in research as well.
Cons
Yankee Group has been a slow decline for the better part of five years now. Glassdoor shows the employee count being at 280+. The company only has about 25-30 employees now plus a handful of data crunchers in Columbia. That's a 90% attrition in about 5 years. The non-competes are what keep people there today. It's a tough environment with high churn. In the last few years the company has lost four heads of research, it's CFO, VP of marketing, 2 heads of sales, 1 CEO and countless other individuals, most of which have not been replaced. Additionally, the company had to sell off the event business losing that asset as well. The website shows the executive "team" being one person, current CEO Terry Waters. Not sure how 1 person qualifies as a team but that's where the company stands today. If you've got other offers, take it as its not clear what the future of the company is any more