I must confess that my expectations for this product were modest to low, based on past experience with different keyboard overlaps. They’ve been far exceeded.
As a long-time writer of academic work that integrates right-to-left Hebrew script into majority-English documents, I’ve recently returned to the craft to discover that Unicode fonts have fast-forwarded a writer’s capacity but presented him or her with an entirely different set of keyboard combinations to master. The Kuzy Hebrew Language Cover is solidly built, yet it allows me to type comfortably on my Mac laptop’s keyboard *almost* as though the keyboard cover were not there.
When I’m working on something else, I have the Hebrew Language Cover at arm’s reach. When I need to do any writing in Hebrew, I slap it on and get to the task.
After a week of working with this product, I don’t see any negatives. A person writing Hebrew-dominant documents will not want or need this product. But for those of us for whom writing Hebrew is a common task in documents that are not Hebrew-dominant, it’s a real find.
Canter Bridge 
how do you switch the direction of the font?
Dear JMS,
Thanks for your question.
Shifting between right-to-left and left-to-right language capacity on a computer has of course nothing to do with the product I’ve reviewed here.
You can probably find the answer for your computer by Googling ‘change keyboard language’ and the kind of computer you use’. I’m a Mac user, and the process is simple with recent versions of the Mac operating system. It involves a slight adjustment in the Settings. After that, Command + Space toggles between the different keyboard formats. I have mine set up to toggle between ‘U.S.’, ‘Hebrew’, and ‘Greek’.
I hope this brief response gets you started.
David