Motorola Photon Q (XT897) / Droid 4 (XT894)
Pros:
Five row keyboard with good layout and tactile response.
Unlockable bootloader (XT897).
Partial compatibility for choice of Linux based OS (XT894).
Cons:
Keyboard is noisy (popping sound on key-press).
Ribbon/flex cable breaks.
Nokia E7 / N950
Pros:
Excellent build quality, materials and durability.
Silent keyboard.
Cons:
Keyboard lacks buttons. The tab, shift, esc keys are missing from the left, meaning the alphanumeric keys are not centered in the hand for typing.
Symbian (E7).
Unreleased (N950).
Fxtec (what we kno