Macbook Air 13" version - http://lon.tv/tn8b6 (affiliate link) Macbook Pro Retina 15" version - http://lon.tv/37w7f (affiliate link) Macbook Pro Retina 13" version - http://lon.tv/hs98d (affiliate link) The Transcend Jet Drive Lite is a great product especially for Macbook Air owners who are always tight on space. It's probably the least expensive way to double or almost triple your available space for under $100 provided you don't need to use the SD card slot on your Mac. The card is essentially a cut down SD card that snaps in securely and sits flush with the side of your Macbook Pro or Macbook Air (be sure to pick the version specific to your Mac model). The card stays firmly in place and requires a bit of effort to remove - I found sliding a finger nail underneath the sides is enough to pry it loose. I worry that over time the side of the card might weaken but so far I've removed the card at least a dozen times with no apparent signs of anything snapping off. One thing to note is that the Transcend Jet Drive Lite is far from a SSD replacement. In fact the write speeds are all over the place, with sequential writes as low as 12 megabytes per second and occasionally as high as 50. Generally in my testing with the Blackmagic disk benchmark the writes were under 20 megabytes per second. Reads, however, were much better and more consistent running anywhere from 60 to 87 megabytes per second. Oddly the Transcend Jet Drive Lite doesn't come formatted for the Mac's native file system. It's formatted with the more universal ExFAT system that's compatible with most computing platforms. I strongly suggest converting it to the Mac HFS+ Journaled format through disk utility so that Time Machine will include the Transcend card with its regular backups. I do suggest checking your time machine volume from time to time to ensure that the drive is properly backed up. Overall this is a nice product that will safely add a significant amount of storage to a Macbook Pro Retina or Air. I just wish the write speeds were more consistent. DISCLOSURE: I purchased this product with my own funds Visit the Lon.TV store to leave a tip or purchase some of my previously reviewed items! http://lon.tv/store Follow me on Facebook! http://facebook.com/lonreviewstech Follow me on Google+ http://lonseidman.com