I have had my little chuck for almost a year and I have had to send it in only once for a new switch. I have had my big chuck for about 5 months with absolutely no problems. These things are bullet proof. If you can afford two of them, do it. The chances of both of them failing at the same time is small and you will always have a back up chuck just in case. Good luck and you would be hard pressed to find anyone with better customer service.