Welcome out of the lurking shadows and welcome to the club!
Great comments on your experiences, especially with the Fieldmate case. There have been lots of questions about it recently but haven't seen any serious criticisms until you posted yours. Good views to have available.
Your power saver comments are also intriuging. I've always used the Toshbia version and have several profiles. Haven't really noticed any heat issues with that. But then like everything Tablet, mileage does vary depending on usage.