I've had a couple of sets of them...
Had a set on the Super Sherpa and now on my XJ600n.
They were pretty much the cheapest proper heated grips I could find for the hack bike on ebay.
Don't bother looking for a make, they're Chinese and crap.
Mine has developed an occasional habit of only heating the rhs and take so long to heat up, I'm 500yrds from work before I realise my left hand is a block of ice and my right is glowing red hot.
Full is blisters after 20 mins, low is lukewarm without gloves.
If they don't suit your needs fit a set of Oxford hotgrips. Sportsbike shop, m&p, demon tweaks usually have them on offer.