I have tested most of the "user interface" and charting components for the .Net environment - and Infragistics NetAdvantage is without hesitation the best component collection in this segment. + Obviously the components are great and gives your project an almost perfect user-interface without much effort – not much code is needed but the components are still very flexible. + It integrates itself neatly within Visual Studio and can be uninstalled correctly if wanted – something many components collections fail to do. + It is definitely very (!) stable, undoubtedly the most important feature! + Well documented with lots of examples (even if I always want more). + Perfect license agreement. No hidden royalties and flexible for the developer “…One developer may utilize a single license on more than one machine as long as they are not used concurrently or shared by other developers…” - excellent, no fuss. + The complete source-code is included – a must if you are a serious programmer.