Used a Keis and more recently a Gerbing. The Gerbing failed and I replaced it with a Warm n Safe as mentioned earlier by someone on this thread. A much better piece of kit even though about another £30 more than a new Gerbing. Compatible with Gerbing controller so didn't need to buy the fancy remote controller. Warm n Safe now stocked by Motolegends in Guildford. Good guys, extremely helpful.