Agree with you on the general quality of the Giordan extractor. One criticism though, is the drill drive mechanism. In my opinion it is the weak point of the system, comprising of a right hand thread 'dog tooth' pulley driven directly off the drill output shaft,(which is fine), but held in place during reverse direction by a LEFT hand thread bolt, which seems to be made from some quite soft alloy. This only reached into the main shaft by about 4 to 5 mm (no where near enough) and due to it's soft material 'stripped' at the first use!
I 'redesigned' this and it works great now. I phoned Agrinova and spoke to Clive (I think was his name), to ask them if they stocked spare bolts, and he said, (rather sarcastically I thought) that he would 'nip down to the local hardware shop when he had time and post one on to me. Well nothing arrived. (Looks like your local DIY shop doesn't stock 5mm LEFT HAND THREAED bolts either heh 'Clive'.) You need to understand the product you sell, not just how to sell them in my opinion.
So the upshot is, Giordan make a good extractor, especially when modified, but the after sales from Agrinova won't help you!
Hope that helps would be buyers.