TatukGIS creates some interesting products. They have end user tools to edit, import and manipulate GIS data and datasets. Their Editor product has become very powerful over time.
I was interested in two other products: their web map server and their .NET controls. The web map server would enable me to natively display the maps I had worked so many months to construct. It could also do routing and other interesting things with the vector based data I had spent so much time compiling as well.
The .NET components solved the problem of .NET not natively supporting the new SQL Server GIS data types. I found their products to be well written and did all I asked of them. The only issue I had difficulty with was installing and licensing the web map server. A few times I needed to call Poland for technical help, and they always did help me and get me running. I really like TatukGIS.