I travelled from Bangalore to Mysore with Sea Bird Tourists and the experience was more or like satisfactory.
Their buses are no doubt volvos but they are a bit older and need maintainance.
There is a time issue with Sea Bird Buses as they kept me waiting for 40 mins that too at 12 in the night when there is lesser traffic.
Price wise the travels are pretty reasonable
Overall they are good tour operators but improvements are necessary to keep them going.