Which are the best and smoothest of the automatic transmissions currently available?

I would appreciate your opinion on the pros and cons of the automatic transmissions currently available and which you consider to be the smoothest.

Asked on 28 May 2011 by RH, Bognor Regis

Answered by Honest John
FAQ answer here: www.honestjohn.co.uk/faq/automatic-transmissions/

Generally, the smoothest I remember have been the CVTs in the Toyota Auris HSD hybrid, Toyota Prius III and Prius II hybrids, and the torque converter auto in the Lexus IS250 and IS250C.
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