I really like the look of the flip cases and I'm wondering a few things before I buy.
Here are two that I have found online. Proporta Alu-Leather Case and Brando BW Leather Case

Firstly, I've heard that the aluminum cases interfere with gps and possibly wifi or other things.

Second, How do they hold the device? Is it by plastic sleeve over the keyboard and if so does it affect its usability?