I took the GMAT last month at THINK EDUCATION ADVISORY SERVICES LLP. in Koramangala, Bangalore. My exam was scheduled at 1:00pm. At 10:00 am I got a call from them saying that there was a technical glitch and that I might not be able to take the exam that day. They said that they would inform me at 12:30pm (just half hour before) whether I can take the exam at 1!! I decided not to take any chances, so I went to the test center. I was told that the technical problem was still not fixed. Then suddenly a tech support person arrived at 12:00pm and fiddled with some wires and got the systems running at 12:45pm. The center chaps told me that I can give the exam at 1pm. By that time I was all spent- tired and frustrated! While giving the exam there were frequent power interruptions, but thankfully the computer kept going. While writing the exam I was hoping against hope that the infrastructure would hold on. It would have been horrible to have a disruption half way through the test. Fortunately that did not happen.
The people at the center were courteous. The seating areas were comfortable, much better than the ones at the Dickenson road center (yes, I've given the exam at both the centers). Recently I've been reading on Gmat Club that several test takers, who took their test at the Koramangala center last month, got their scores cancelled for reasons not clearly specified:
gmac-cancels-gmat-scores-199372.html .
In conclusion, I would be wary of taking the exam at this center. It's better to plan in advance and take it at the Dickenson road center.