I'm not sure which is worst, but I worked with a fella awhile ago, whos step-dad ownes a small chain of transmission repair shops. He said it's a seriously profitable buisness. There's a very large mark-up on the parts, and the labor cost is way over blown.

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past MB rides:
'68 220D
'68 220D(another one)
'67 230
'84 SD
Current rides:
'06 Lexus RX330
'93 Ford F-250
'96 Corvette
'99 Polaris 700 RMK sled
2011 Polaris Assault
'86 Yamaha TT350(good 'ol thumper)