I've been wearing a Gerbing's jacket liner and gloves for three years and with three different bikes. The one I have now is dual-wired, so I can adjust the temp of the gloves and liner independently. I will never ride without electric gear again. If it's very cold (on a bike at speed, <40degF) and you're moving at any speed, any insulation you have will only work so well -- heat is always being lost. If you dress up too much, you lose feel and control, making riding more dangerous.
The electric gear adds heat to your system rather than trying to prevent loss. That's a big difference -- even a little bit added just to your top (body's core) helps keep the rest of you toasty. Add the gloves and your fingers retain complete feeling and control. I've tried heated vests and the complete Gerbing's liner and I can't live without the Gerbing's -- frozen arms suck, and the plugs for the Gerbing's gloves come out at the cuffs of the jacket liner, making using the gloves very straightforward.
The only hitch is power -- watts, to be exact. The liner takes 77w, and the gloves about 12w (both when up all the way, which doesn't happen until you're below 20degF). I don't wear a pants liner and haven't needed one, but you can get one that hooks up to the jacket liner.
The Gerbing's gear I have uses a BMW-style powerlet plug. I got a fused, weatherproof, 15amp powerlet kit to mount on the 'Busa's inner fairing (generic sportbike kit) from
http://www.powerletproducts.com . I save watts elsewhere by using HIDs (saves ~20w each). The reason for this concern is that the 'Busa's alternator is good for a sportbike but has than 100w to spare with the low beam on.
Lastly, this setup lets me commute in winter.
The jacket liner and gloves work so well I don't have to wear long underwear, wool pants, or whatever -- just the Gerbing's stuff, my regular gear (incl. armored Gore-Tex overpants) over my work clothes, and I carry some civilian footwear in a backpack on a tailpack. If the weather is so-so but might change, the liner and gloves insulate well enough themselves, so you can just carry the wiring/controller in your pack in case it really gets cold.
<!--EDIT|mcoyote
Reason for Edit: None given...|1104466522 -->