Greg,
I just received the second Scorpion that I purchased - the 515 kV version. I will be using it on a Matt Saphir I on which I'd like to turn a slightly smaller prop than on the Chipmunk.
I've attached a couple of snaps to give you an idea of the quality. They don't carry the cache brand name that Hacker, Pletty, Neu and the like do but they are very nicely made. I'd venture better quality than Rimfire, E-Flite and such. Doug Woodward (Fatherof4) is using one just like it in his Conquest IVe (build thread on RCG). He's very happy with it.
I got a great deal on them from a store here in Canada that had them at 40% off so I couldn't pass them up.
David
P.S. The Scorpion performance table for this motor is here:
http://www.scorpionsystem.com/files/...data_chart.htm