The Jung regulator has 3* serious compromises:

1. When output current demand exceeds the maximum available from the regulator, the regulator's internal control loop opens and all internal nodes become unstable. This is because the loop amplifier sinks part of a constant current away from the base of the output transistor. When high Iout requires all the constant current as base current, none remains for the loop amp to control, thus the loop is uncontrolled.
   
2. The regulator control amplifier is connected to ground, which limits Vout to the power supply range of this control op amp., typically 30V or less. It also prevents the use of awesome new op amps with lower power supply range, for example you can't use a 12V op amp to make a 15V Jung regulator.
3. All those capacitors! Three 100µF or more capacitors take a lot of space. They also can cause stability issues depending on the PCB layout and the op amp you use.
4. *We say 3 because this compromise is optional—the pre-regulator. By using a monolithic pre-regulator, you limit dynamic output current delivery to whatever can be sourced by the LM317.
   

Superpower solves these problems:

1. Superpower uses a voltage to control base current to the output transistor. When base current reaches its maximum, the loop still has control voltage.
2. Superpower uses a floating reference and control amplifier, allowing Vout as high as BVceo of the output transistor.
3. Superpower needs only a 22pF loop and 10µF output capacitors for stability. It fits on a PCB only a little bigger than a TO-220 package.
4. Superpower needs no pre-regulator.
   

With clever design, Superpower has all the advantages of a Jung boot-strapped regulator and none of the disadvantages. Following are oscillograms of a "Jung 2000" derived super regulator created by Andrew Weekes and found here, referred to as ALWSR regulator, compared to Superpower. Both devices were tested with as nearly identical conditions as possible, with both devices using the same input supply. Vout = 10V for both regulators.

Current was tested at 700mA with the standard Superpower device, which begins to limit current at approximately 700mA. To allow direct comparison, the ALWSR circuit is also tested at 700mA.

The tested ALWSR circuit does not have the pre-regulator, and uses a D880Y pass transistor instead of a D44H11. It requires an additional 10pF capacitor across the 499Ω low pass resistor for stability at all output currents as seen in a photo below; this extra capacitor is not specified for the stock ALWSR.