Robot centered research aids in stroke rehab, wheelchair guidance

Which of these previous reported wheelchairs will be compared to see what is the best for certain conditions?
I'll take the RipChair;

People with paralysis could drive this wheelchair using their tongues & a smartphone 

electric attachable handbikes

Turn your wheelchair into a motorcycle

Other mobility possibilities here:
Or maybe you'd prefer one of these other ones

http://www.wimp.com/newdevice/

 or Hondas;

 Honda's "mind-controlled" UNI-CUB β

Or this;

intelligent wheelchair system for older adults with cognitive impairments

Or this cool one;

Deep sea diving … in a wheelchair

Or this;

wheelchair like Segway

Or a:

standard wheelchair that is almost impossible to drive one-handed 

http://inhabitat.com/equal-a-compact-electric-vehicle-specially-designed-for-people-with-disabilities/

Extreme Offroad Tracked Wheelchair the Original Ripchair 2.0 

The latest here:

 Robot centered research aids in stroke rehab, wheelchair guidance