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.
2013 Ducati Monster 796
Moto Guzzi: 2013 V7 Racer, 2006 Breva 1100
BMW: 1973 SWB R75/5 "Toaster", 1994 R100R Mystic, 2003 F650GS Dakar
Honda: 01 VFR800, 93 VFR400R(NC30), plus many vintage Hondas.
Scooters: 2007 Vespa GTS250ie, 2009 Kymco Agility 125