I have two friends having an automatic matrix, never heard them or anyone else complaining from problems in the gearbox.
But there is something to bear in mind....The matrix is a family car not a sports car so do not expect its engine to have the same performance as the Elantra for example....One of my friends who has a 2007 Elantra drove a Matrix (both automatic) and noticed that the Elantra has much better acceleration.
But on the other hand one of them had an automatic lanos before and he says the acceleration is better than the lanos.
Anyways it a great overall car and one of the best in its price range.
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