The only comment which I don't think has been covered here is the AppleCare warranty factor.
I had two of my four original 1 GB RAM sticks in my MP 3,1 fail while it was still under AppleCare. Not only did Apple replace the two sticks, but "just to be on the safe side" they also replaced the riser card.
I know places like OWC have lifetime warranties on their RAM, but as a business owner and from a convenience factor, I find it highly efficient to have the entire machine covered under the same warranty and know there's a physical location I can take it to.
I had two of my four original 1 GB RAM sticks in my MP 3,1 fail while it was still under AppleCare. Not only did Apple replace the two sticks, but "just to be on the safe side" they also replaced the riser card.
I know places like OWC have lifetime warranties on their RAM, but as a business owner and from a convenience factor, I find it highly efficient to have the entire machine covered under the same warranty and know there's a physical location I can take it to.