I've been in the commercial electrical trade for over 10 years. I have a lot of tools and these roto splits are extremely reliable. They are much better quality than the homedepot cheapo kline roto split that you would commonly see an apprentice using. The last time I had to buy a this same roto split was 7 years ago. The only reason I needed to purchase another one was because some one broke into my garage and stole a bunch of my tools about a week ago while I was on vacation. None the less I would guarantee these will last me until retirement.