Square socket fits perfectly (just snug enough and not too loose like some) on standard tension rods allowing for quick reversals as well as leaving in place while testing head pitch.
Orange rubber tip provides for rapid loosening and tightening (as others have mentioned) and the tips on both of my keys do not move so possibly Sonor has starting gluing them in place. The indentations on either side of the handle (ears) also make for a very comfortable and precise grip while fine tuning.
The chrome and overall build quality are typical 1st-class Sonor and if there's any room for improvement it would be an insignificant nit-pick... the inside of the socket is not completely chromed and the copper plating is exposed, but some silver paint could easily add protection if desired.
Kudos to Gavin Harrison and Sonor for a high-end, low-cost product. You'd be hard pressed to find a comparable key for a similar under $5 USD cost.
I was unsure when I bought two of these keys, but they made tuning so much easier. I managed to get my Ascent snare in tune with itself much quicker than ever before, and the rubberised grips at the top really help with the finger-tightening phase.
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