I have been installing Jasper engines for at least 20 years and personally feel like it is the best remanufactured engine out there. I used to build the engines for most of the stuff that came through the shop but now I just build the "special" stuff and sell Jaspers for everything else. The turn around is much quicker and when you factor in the additional labor for rebuild as opposed to installing a long block there isn't much difference in price to the customer. My local machine shop won't give me any more than a 12 month 12,000 mile warranty and the Jasper has a 3 year 100,000 mile parts & labor warranty. The few problems I have had with the Jasper product Jasper has stepped up and taken care of. There are a lot of engine builders out there that will give you a warranty but until you have a problem you don't know how good that warranty is.