The deal with the Scorpion was that it had better features and better performance than it 's counterpart, the old CU100/101B.
It has further drilled, lighter titanium coated spool which makes it cast a whole lot better than the old Curado 100B.
It comes with external adjustable braking centrifugal system, similar to what you find ina reel with magnetic braking, no need to open and remove the sideplate like in the old CU100D.
It comes with cold forged handle, handle only found in the domestic high dollar shimano reels like the Chronarch SF, Chronarch 100MG and Calais.
It comes with Septon contoured handle knobs, better grip than the regular knobs found in the old Curados.
It comes with aluminum spool tension knob cap while the old Curado had a cheap plastic cap.
It was a little bit lighter.
All those features makes the Scorpion 1000/1001 a better performer than the old Curados.
The Scorpion Mg had until the Chronarch 50 mg appeared no comparable model.
How much ? if you shop around you can find it as low as $120
Where ? there are many japanese reel dealers in the US and in Japan: JapanTackle, SpecialtyTackle, Brooklyn Bill 's Tackle Shop, GinRinPeche.