>> Bob, my keyboards have only a delete key and it works as a backspace key. There is no key labeled Backspace, just Del.
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If doing any kind of text edit volume, that is too bad. DEL "should" delete the characer under the cursor - and continue forward doing that, whereas Backspace deletes the character to the left of the cursor and continues in that direction. If you only have a Backspace key, you must move to the right of anything you want to delete. You should be able to delete in either direction according to where the stuff is you want to delete vs. having to make a round trip from your current position.
>> The slideout keyboard has 2 shift keys and they work as expected.
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Terrific!! I'll bet that was based on a lot of negative feedback on the single shift keyboards. Ned, based on my experience with thumbing a fixed keyboard vs. the on screen keyboards, if you learn thumbing, you will probably be glad you have the fixed keyboard. You touch type, so the motor movements do not have to be relearned with thumbing - whereas with single touch with finger or stylus, you must think about where each key is located. And, FWIW, my thumbs sure prefer those raised keys.