Anyone Else Notice How Tempermental the iMac is with 3rd Party RAM?

I recently upgraded my 2007 iMac so Lion could run more smoothly by adding RAM from Crucial.
The machine worked fine for a few days then I started experiencing kernal panics.  I suspected my new RAM wasn't seeded properly.  The last straw was when I shut down the system to re-seed the RAM and turned it back on, the machine beeped three times at few second intervals (which indicates a problem with RAM) and would not power on.
I moved it to a different slot--still no joy.  In an effort to just get the machine started, I tried other 3rd party RAM that was compatible with the iMac that I had lying around.  Still no go as the machine would beep loudly and not power on.
I finally found some RAM I had taken out of my 2007 Macbook Pro when I upgraded it.  It was the original RAM that had come with the Macbook Pro.  It worked like a charm.
But I'd like to upgrade my RAM.  Guess I'll have to take a trip to the Apple store and buy from there--much more expensive though. 
Anyone else have issues with RAM?

Mac's are not tempermental with third party RAM however they are sensitive to the following RAM issues:
1. Incorrect RAM specifications. RAM specs must exactly meet Apple's specifications, period! Installing incorrect RAM will cause KPs.
2. Unseated RAM. Unseated RAM will cause problems.
3. Failed RAM, this is more unusual however it's possible to have a RAM DIMM be defective of fail at a later date.
The only third party RAM I would not recommend for your machine is Kingston Value brand, this has been troublesome. However if you use OWC or Crucial both are great vendors and sell RAM that works assuming 1, 2 and 3 above.

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