Summary: This processor makes the job of running several programs at once easier to deal with than what I was used to with previous processors. The 2mb cache helps with that so don't settle for the 4200+. Gaming has been better, clearer, and more stable, but there still could be room for improvement. The down side is that it takes alot of computer skill, with the OS and the hardware, to run it properly.
Pros: Speeds up load times when running multiple programs; 64-bit processing; Lower heat output; Good for gaming
Cons: Alot of windows configuring needed to utilize full potential; Tricky to overclock
Summary: With this processor installed, my system never slows down. As a side benefit, it runs cool and doesn't consume much power. Even the stock cooler keeps it under 50 degrees load, which is impressive. For those wondering whether dual core is worth the upgrade, the answer is "it depends." If you do non-trivial multitasking you'll see huge performance games. By multitasking I don't mean running Word, Excel, and Winamp at the same time - any computer can do that.
Summary: I use this with an Asus A8N SLI premium motherboard. Have not had ANY problems. I am not an experienced computer builder, but I had absolutely no troubles constructing the computer around this processor. I used some type of Arctic Silver as a compound and did not experience heat issues (although of course this thing will run hot!) I felt this processor was a sweet spot between more expensive and cheaper processors.