Create accurate and precise raster datasets. When you create raster datasets with Raster Tools, you will achieve more complete and accurate representations of your real-life data. Raster Tools, an Esri ArcGIS add-in, gives you more interpolation options and more control interpolation parameters. Represent your data at its best with Raster Tools.
I found Raster Tools very stable and performed as well or better than the ESRI tools.
Raster Tool’s interpolation algorithms are the same, well-known algorithms found in Surfer, our 2D and 3D mapping, modeling, and analysis program. These algorithms have helped scientists and engineers across the globe transform point data into high-quality raster data sets, ready to be mapped and modeled.
I feel it generates some of the best grids when compared to Geographix, Petrel, and ArcMap. It's also extremely cost effective.