One of the Best Accessories Evar!!
I love the LCD Bac Pac. Not just because it can turn your GoPro into your own personal handheld camera or that you can now tweak your angles before heading out. It is how seamless the Bac Pac incorporates itself with the GoPro. It easily attaches onto the back, allows for video playback and picture viewing (with a little practice) and it doesn't interfere much with its application of use at all.
Please note that a firmware update is needed for this accessory, but it is available through the GoPro website and they give great directions on how to install. Out of all the GoPro add-ons out there, this is a must-own.