I have the same case you are considering. It is on par with Motorola and Macom cases as far as the quality. It has a plastic window covering the keyboard and display. I didn't know if I'd like that, but now I'd like to have the same type of window on all my cases. It is flexible and heavy duty where cracking is not a concern. I don't know the size of the swivel, but it is the same as Motorola's and I can interchange the two.
If I had to get a case custom made for the Pro-106, this is what I'd want. Every cut and hole designed into the case is in the exact right location. I have taken this case with me everywhere for a year and it would still pass for new. I have bought this type of case for every radio I have ever owned and after years of use protected by this case the radio still looks new. I have always been able to get top dollar reselling my radios because they look so clean. I like the case because it is a good sturdy hard case.