Steel reinforced ABS housing
Ambidextrous charging handle
Superb German quality
Top and bottom machined Aluminum rails included.
This unique shaft system is for Glock pistol models 17, 19, 22, 23, 31, 32: A simple assembly through utilization of the available front Picatinny rail as well as the included front rail locking bolt. Included is an ambidextrous charging handle which gives the possibility of assembly to both right and left handed shooters The G.C.C. has a super ergonomic design and allows the possibility to mount a front fore-grip, lamps, lasers and iron sights to the additional Picatinny rails. All models come with a cheek rest that is made of a high quality neoprene rubber for extra comfort.
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Simple assembly
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Outside shaft body
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For right and left handed shooters
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Machined Aluminum Picatinny rails
My bad, its a steel reinforced body.

Price is $499usd. So I guess it depends on if you have access to the US firearms market but for me it is cheaper and better quality (I have held both products and the above mentioned one is of far better quality).
The other unit feels like lego.