The fit is very good. The hard drive is easily fixed with 2 integrated screws (screwdriver included). The front panel is fitted, so that I could exchange this even against the originals of the notebook. Could not be better.
In order to still be able to read or burn DVD's, I've bought an external DVD burner with USB connection.
Since there are very different reviews of this product which must probably be depending on the notebook model. In my case, as I said 100% function and I am very satisfied with the shaft!