Wheelbarrows can be a tad unstable at times. Some sort of stall-warning device would come in very handy.
Just as long as you don't rely on it as even the simplest mechanical device can go wrong & the calibration or positioning of the actuator switch might vary considerably on different aircraft, even the same type. Some might work better than others or have a habit of sticking. I think this was one of the reasons for my boss not liking the idea, especially on a basic trainer. Far better to be able to recognise an impending stall without depending on a instrument.
If I remember correctly there were several fatal accidents involving the Tomahawk when it first appeared. I don't know what they did to rectify it but some people are still very wary of its bad reputation. The local flying club seems to operate them with no problems but I'm not sure I would fancy learning on one.
PS. Tomahawk Safety Review - February 1997. http://www.aopa.org/asf/asfarticles/sp9702.html
BTW, that "Red Barrows" pic is one of the silliest things I've ever seen... but do they do formation "barrowbatics"? I'd like to see that...
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