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I bought this upgrade to the 2 x 2GB sticks in my Mid-2010 Macbook Pro 15" i5. I had no compatibility issues and it produced a very noticeable speed boost. If you feel your Mac is in need of more memory, I would recommend the following to know if your RAM is the issue: Open Utilities folder -> Open "Activity Monitor" -> Click the tab at the bottom labeled "System Memory" -> Just below that, you should see a few sets of data...The important ones are: "Free" : If your "Free" memory is low (or 0!) you probably need more memory. "Page Outs" : If the "Page Outs" is high, this means that your computer is using hard disk rather than RAM for memory functions and produces a severe loss in speed. "Swap Used" : This gives a rough estimate of how much hard disk is used for RAM. This will give you a rough idea of how much RAM you should add. i.e. if this is 4 GB, then you should add at least 4 GB. You should check these numbers while doing the types of activities you normally use your computer for. Not just at idle with nothing running! As far as this item goes, Crucial is a known Apple-friendly RAM and is unlikely to give you any issues. It is also a high quality manufacturer and is much more reliable than some cheaper brands. Remember, RAM is dirt cheap these days so don't save a few $$ to buy inferior quality RAM! You should just not buy any if you are going to buy a terrible brand. For people with a Macbook Pro, install is quite easy. You can find many manuals on the internet (I prefer iFixit). Don't be intimidated buy installing it. You can save a lot of money by doing it yourself. If you feel uncomfortable, then by all means have someone qualified to do it for you.