For the price, this coring machine worked very well. I only dilled one 8" diameter hole through 10" of very old concrete and it work extremely well. Local contractor quoted nearly $1000 do drill this hole! It does not have all the bells and whistles on more expensive machines, but for the price, it did a great job. Since i only used it once, I cannot comment on durability, but it seems solid and well made. If you only have a few holes to do, i would definitely recommend this product.