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The problem with belt-type CVT’s is that they tend to be heavy and not all that efficient compared to even conventional automatics. Also the first couple of generations of CVt’s developed a reputation for not being very durable. The current ones used by Nissan, Toyota and Honda are probably pretty reliable and durable and they are more efficient. The efficiency does not come from the actual mechanical efficiency of the transmission, but from the wide and infinitely variable gear ratios that allow the engine to run at the most efficient speed/load point. The exception to this is when the driver calls for moderate-to-heavy acceleration, the programming tends to make the engine buzz up to high rpms to a greater degree than a conventional automatic. The CVT that is in a Toyota Hybrid is completely different and is a very simple and durable device known as a Power-Split Hybrid system. These are probably the most efficient and durable transmissions in production.
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