i use a tumbler almost everyday, i have 3 lymans 2500 since they have came out..i have had numerous problems,.. this is used by their guide lines they recommend...i have has some last 2 weeks some as little as 10 hours.. i have have motor bases crack, motor lock up , you name it it has happen... i have told them time and time again. they have a flaw in these tumblers....... finally in june, 08 i contacted them once again..sent another one back... they told me they have had a design change on something , they wouldn't say what. i couldn't see anything different , but his one has lasted longer than any i have had...... i will say they have always sent me a rebuilt one , but it is hassle, it cost me $16.00 + to ship them back.. they paid for the last one to be shipped back.. maybe they have fiqured it out.. some of these problems have occured with half of what they say is max weight....