Ive had good ones and bad ones. Newer systems are pretty smooth and seamless. I had a peugeot rental not too long ago that was excellent despite being a manual transmission.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth