I have done my MBA from XLRI, and I prepared from IMS. To my opinion it is one of the best one can get. They simply score over other coaching institutes because of the experience they have in this line and their single focus, which always helps them to be on track and provide the best one can.
Again one thing you need to be careful is that whether the center is franchise or extension branch of IMS Mumbai. ensure that you prepare from Extension branch of IMS Mumbai, managed by the head office and it is not a franchise, because the key to preparation is study material and faculty. and when it comes to faculty, those franchise centers are not as good as branch centers.