Is Core2 Duo much better than Core Duo?

I'm considering buying a pre-owned 20" iMac Intel Core Duo 2.0GHZ (early 2006). I believe this was Apple's first Intel iMac before they upgraded the iMac line to the Intel Core2 Duo processor.
A couple of questions please:
1.) What's the primary difference between Core duo verus Core2 Duo?
2.) Were there any issues with the first generation of Core Duo iMacs that I should be aware of?
Thanks very much.

1. Core Duos are 32-bit processors, Core 2 Duos are 64-bit processors. C2Ds are faster and support more memory - 2nd generation support 3 GBs, later generations support 4 GBs. Core Duos only support 2 GBs. C2Ds have faster CPU clocks.
2. There were reports of heat problems, but later firmware updates seem to have resolved those problems.

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