Being a Ph.D. student, I am interested in the theoretical background of the NL5, since this is the key for right results. Although the NL5 is a commercial product, the author explains how the simulator is built and even points out the situations where potential troubles can appear. My questions about the simulator core were always answered in details as much as possible. Testing the NL5, I tried to simulate some non-standard switching circuits, for example the power gyrator. In contrast to the SPICE based simulators, the NL5 was not only able to cope with these circuits, but also arrived at the right results in extremely short time.
 
— Alexander Kushnerov, M.Sc., Ben-Gurion University of the Negev
        June 12, 2010
 

 
As a power electronics engineer, I have found NL5 to be a highly-versatile product that allows me to focus more time on product development activities and less time on solving SPICE simulation convergence problems. I believe that NL5 is the ultimate tool for anyone who is involved in power electronics design and development activity. The cursor data table measure mode and powerful C-language scripting interface have been very useful in saving me countless hours of work.
 
— Ken Finley, Advanced Energy Industries, Inc.
        January 12, 2010
 

 
I have been using NL since 2002. Right from the beginning NL was a fast, stable and simple tool. Further significant modifications for expanding possibilities of NL, increasing accuracy and improving interface did not deteriorate the speed and stability. Furthermore, as users preferred, some additional options in modeling were incorporated into NL. Currently, NL is my best tool for transient analysis and optimization.
 
— Simon London, Ph.D., BAE Systems
        October 21, 2009
 

 
NL5's simple MATLAB/Python link has allowed us to create our own converter simulation environment for accurately characterizing our efficiencies using electromagnetic co-simulation. Amazing for such a simple tool. Whatever capability NL5 doesn't have by default, you can create on your own!
 
— Donny Zimmanck, Enphase Energy
        October 9, 2009
 

 
I am a rather new user of NL5. At first, I must confess, I was a bit skeptical about the potential of a simulator that can be zipped in roughly 1 MB. It was a matter of hours to discover the powerfulness behind the simplicity of NL5. Its versatility, easiness, speed and stability made NL5 my default simulator.
 
— Pablo Martín, National University of Mar del Plata, Argentina
        March 30, 2009
 

 
I'm using NL for more than 10 years. It developed into a very good tool: user-friendly interface, fast calculations, AC sweep option. It is definitely tool of choice for power supply engineer.
 
— Andrey Malinin, iWatt
        March 26, 2009
 

 
I am using NL since 1996. It was love at first glance. Just tried it and never wanted to return to SPICE again. All convergence problems were gone and speed increased dramatically! Well, to be precise, I still need to use SPICE once in a while, but I keep it to a minimum.
 
— Michael Kishinevsky, Ph.D., Draper Laboratory
        January 6, 2009
 

 
NL5 is my tool of choice for simulation of switching power supply circuits. It is faster and more stable than any SPICE implementation I have used, including several commercial packages.
 
— Rusty Jewett, Ph.D., CEO, Sencera
        January 5, 2009