I bought the plug for my first-generation Tourmaster, and use it with a Gerbings dual controller (will work equally well with the Warm-n-Safe one). The plug was only $8 -- IMHO better than having more wire dangle.
Anyway, it works great! It was 28 degrees friday morning, and I was nice and snug in it.
Duc M796 & 250 Monza, Guzzi V7R & Breva 1100, BMW F650GS Dakar, R100R Mystic, R100S, R75/5, 01 Honda VFR800, 76 CB400F, 68 CL175, Vespa GTS250.