Pros
There are some very talented people at Grameen Foundation. Most of them work on the US West Coast or in the international offices. They have great ideas, great work ethic, and impressive intelligence. If you can work with those people, you might enjoy working at Grameen Foundation. Another pro is that GF uses modern technology, like Salesforce, which I've come to really miss since moving on to my next employer. Lastly, the work-life balance issue probably varies from team to team, but I had a good experience with it in that I could work from home when I needed and rarely had to work more than 40 hours in a week.
Cons
While some international offices might have a data-driven strategy for creating positive economic change in their communities, the organization overall seems to have run out of steam, and some of GF's international programs seem very close to shuttering (turns out it's really hard to raise money for programs with no strategic direction.) Senior leadership seems to have run out of good ideas, they don't have the discipline to solve hard problems, and they stubbornly resist acknowledging failures. The CEO in particular is extremely out of touch (the roof could be on fire and he'd insist on telling you about all the "important" people he schmoozed with on his latest trip to God-knows-where.) Meanwhile they've had a troubling number of lay-offs in the last couple of years, which makes me think that GF is in really serious financial trouble.