Aamco (25+ years ago) used to have a pretty bad reputation. If you went to Aamco with ANY transmission problem (fluid leak, shifting problem, slipping, shuddering), the fix for every problem was usually the same:
We can't tell anything until we get the transmission out of the car. By the time the trans is out of the car and blown apart on the bench, you might as well pay us $1500 to rebuild it.
Aamco used to run TV commercials all the time (20 years ago) with this tag line...
"Half the cars serviced by Aamco don't need a new transmission"
When I took transmission class in auto school, my instructor used to joke that their tag line should be...
"Half the cars serviced by Aamco don't need a new transmission...but they get one anyway"
Times have changed...and like these guys are saying, these places are independently owned. If you found a good one, then stick with them and give them your business.
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View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)