Transcend has put together a simple tutorial video on putting their product to use:
You simply mount the JetDrive into the supplied caddy, start your MacBook in Boot Recovery mode and clone your current SSD to the new JetDrive. Then remove the SSD from your Mac, insert the JetDrive and you’re good to go. What you’re left with is the caddy and old SSD, which you can combine to make an external USB 3.0 hard drive.
Transcend has also released JetDriveToolbox monitoring software, which is designed to analyze the health of your hard drive, and “Additionally enable TRIM support for your JetDrive in OS X®, maintaining optimum write speeds and maximizing the lifetime of your SSD.”
There is currently only support for the MacBook Air, MacBook Pro Retina 13″ and some previous MacBook models, a full compatibility list found here, and you can identify your Mac model here. Hopefully we’ll see support for the 15″ retina soon also.