I have recently purchase numerous Bosch tool from Amazon\/Tool Crib and I have be a life-long Bosch fan . however , I have to say that this be the very first time I have be let down by one of they product . I guess I just get a rare `` lemon '' . immediately on use it , I have problem with the `` lock-on button '' . either it would not keep the machine running , or when it do engage I could then not stop it ! it work sporadically , but usually not until I have try to disengage or engage it several time . then , after just 15 minute use sand some deck timber , a loud clatter develop . sound like a bearing problem ? this do not seem to unduly affect performance , and since I purchase the unit for this specific job , I carry on for a while . then , the rear belt wheel start to slip or disengage , like a slip clutch . the work I be do be not unduly difficult and for a period of time , the work be go like a dream , much as I be use to with Bosch tool . so finally , I just give up-extremely disappoint that I could not finish the job at hand . I have return it and I will get the 1276dv instead .