I don't even know what to tell you bro... heated grips are the bomb.
I live in Canada and its freakin' cold up here. Seriously, heated grips are absolutely incredible. I would never get a bike without them.
Everyone I know who has them would never go back. For some reason, toasty warm appendages make the whole body "feel" warm.
But that's just a feeling...
Here's the real deal: In cold weather your reflexes slow down, starting in your extremeties, like your fingers. Your fingers work your brake (!) and your clutch. If those two are slow, you are in trouble.
I've found that with heated grips, not only am I waaaay more comfortable, but I can actually hit the brake and clutch much more quickly in cool weather.
Heated grips are a no brainer and I've been riding for 25 years. I turn them on automatically ... if its a hot day, THEN I turn them off.
You will regret a lot in life: Women, stock trading, taking a swing at a cop.
You will NEVER regret buying heated grips. 8)
Tip: Hit the 'on' button while you are warming the bike up so that the grips are toasty hot when you get on. Otherwise you'll have cold hands before they warm up!