I've had a Ctek for 13+ years now and swear by it, wouldn't be without it. I was advised when I bought it to make sure that the surface it was sitting on allows it to keep cool as they don't take kindly to overheating, mine rests on the windscreen wiper blade and has never been a problem. I have the dedicated "traffic light" connector hard-wired to the battery, more outlay but less of a faff connecting. The BIG advantage with the ctek is,of course, you don't have to disconnect the battery from the car. I also have the aldi charger, fantastic value but my understanding is that you must disconnect, correct me if I'm wrong... A sound investment, money well spent.