Safe to buy late 2009 3.06 iMac?

[The Final Cut]

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Came across a good deal on eBay. It's has a 4850 Ati and is about 1000 usd. It appears to be perfect but can I still get 3 years of use out of it? Do theese have logic board problems?

 

[alust2013]

Not sure if there are any logic board issues, but that would be useful for at least 3 years, i would say.

 

[The Final Cut]

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I should state that I am only talking about reliability and overall quality not performance. Just want to be sure that the older iMacs have good health over the long term...