I have a review on the
DLR165K here you can check out if you want.
Laser is more accurate and that is why it is not called an estimator, it is almost exact.
I use the DLR165K to measure walls for cutting baseboard and crown and it is more accurate than a tape measure is over long runs. The DLR165K is a good unit for the price, and well worth it. One thing bad about the DLR165K is it doesn't measure in running inches, only foot-inches. If you need inches only, check out the Bosch DLR130. It has a few less features then the 165, but it has running inches.