MMS is in transition on it's business plan and there is a fair bit of chaos in the struggle. The move is worthwhile, but it can wear you down. Culture is kind of difficult due to the fragmentation of the business units, but it's trying to improve. IT and product management will hopefully get their act together during the transition and work out the company's major issues (I am pulling for them).
Until then, the clash between legacy and new business makes things tough. Since it's hard to tell where things will land at the moment, I wouldn't recommend going to MMS if you need order to be happy.
Great Vacation, 401k is decent, flex time, work from home
Company is not sure what it wants to be yet and there is a lot of back and forth