I've just had a set of Keis heated grips arrive having subscribed to Bike magazine and wonder if they are any good?

The subscription offer was for Oxford grips but I got a note saying they'd run out and were sending Keis instead.

I've got Oxford heated grips on my bike already and was going to give the new ones to the OH.

Just a bit worried as they look a bit like the grips he used to have on an old bike which barely gave off any heat.

My Oxford ones get so hot sometimes that I almost cant grip the bars even with gloves on.