Just got mine setup on the weekend. So far I am pretty happy with it.
Being able to read FAT format CF cards natively is great, makes it really easy to transfer files downloaded on my PC to the Amiga.
I've yet to install Workbench to a CF card and try out WHDLoad - that will be next weekend's project
I think its a great expansion for the A500, really makes it a lot more flexible.
I'm using the CatCase from amigastore.eu and although its a little rough around the edges, if you don't look at it too closely its fine.
If they made a proper wedge shaped beige plastic case in the same style as the A500 I'd be all over it
Maybe 3D printing is an option....