Last year I bought a pair of Keis heated glove liners from the Sportsbikeshop returns / seconds listing on a well knows auction site.
I tried them once or twice, but the phaff of plugging stuff in and having cables running through the jacket saw me ending up just putting ordinary liners in my gloves and getting cold hands.
Last Thursday, I rode down to meet a friend near Dawlish, Devon.
It's about an hour and a bit straight down the M5 and temperatures were set to be about 7 to 9 degrees, so I stuck some silk liners on, my big winter Richa gloves and off I went. Needless to say the 30 MPH crosswinds all the way down the M5 brought the chill factor down and by the time I got to my destination, I could not feel my hands.
The return journey was across country, not quite as across country as planned at the A396 is currently closed. But before setting off, I wired up and plugged in the Keis liners.
All I can say is that they absolutely work!
I was told last year by another user that you don't actually feel any heat and there is no controller to turn the heat up and down, you just put them on, plug them in and they keep your hands at normal temperature... in short, you just don't get cold.
They are a little bulky and took a bit of a wiggle to fit inside my winter gloves, but once on I was easily able to work all the controls and my fingers didn't feel squished.
So, a big (warm) thumbs up from me on the Keis gloves. Well worth cabling yourself up for.