I have the NM module on my MCS. BIG difference in power. Noticeably more pull in particular.
Took me about 10-15 mins to install and I can remove it just as easily. I keep mine on the HIGH setting and have never had a problem including pushing it hard on a track day, using 92 octane top tier gas.
I think Burger Tuning has said their module would work on the JCW, but I'm not sure about the NM unit.