Unfortunately I've yet to hear good things about any battery-operated vests or gloves. I can't admit to having tried them myself, but they don't review well compared to a proper 12V system. Now, if you don't have the extra amps to cover it in your electrical system, then battery op might be the way to go... or if you're allergic to cords. Me, I have a 12V outlet in my dash I'm not using... so...
Now, if this stuff can be fitted to 12V it ought to be good
I tend to go to
http://www.webbikeworld.com for reviews... they have reviewed the latest stuff from Gerbing quite well. Check it out, I like their site a lot.